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PMA2016/Lagos-R3 SOI


Summary of the sample design for PMA2016/Lagos (Nigeria)-R3:

In Nigeria, the PMA2020 survey collects data at the state-level to allow for the estimation of key indicators to monitor progress in family planning - both at the population and the service delivery points (SDPs) levels. PMA2016/Lagos-Round 3, the second round of data collection in Lagos state, used a two-­stage cluster design. Primary sampling units were selected using probability proportional to size procedures. The sample was powered to generate state-level estimates of all women mCPR with less than 3% margin of error. To read more details on our survey methodology including the survey tools, training, data processing and response rates, please scroll to the end of the below table.

The table below provides a summary of key family planning indicators and their breakdown by respondent background characteristics. Estimates for all indicators are representative for the state. To view the breakdown by background characteristics of the respondents (including education level, wealth quintile, region etc.), please click on the respective indicator link. Distribution of respondents by background characteristics is available here. Distribution of SDPs by background characteristics is available here.

Additional detail on sample design, data collection and processing, response rates, and standard errors are available below the indicator tables.

Download the full SOI tables >>

PMA2020 Standard
Family Planning Indicators

Round 3
All Women Married Women
Utilization Indicators:
Contraceptive Use    
Contraceptive Prevalence Rate (CPR) 28.0 34.9
Modern Contraceptive Prevalence (mCPR) 21.0 26.4
Traditional Contraceptive Prevalence 6.8 8.3
Contraceptive Method Mix    
Contraceptive method mix (stacked bar charts for all/married women)    
Demand for Family Planning and Fertility Preferences:
Unmet need for family planning 17.8 23.7
Demand for family planning 45.6 58.3
Percent of all/married women with demand satisfied by modern contraception 46.1 45.2
Percent of recent births, by intention
Wanted then 72.6 74.9
Wanted later 14.2 13.1
Wanted no more 13.3 11.9
Access, Equity, Quality and Choice:
Percent of users who chose their current method by themselves or jointly with a partner/provider 58.6 89.5
Percent of users who paid for family planning services 39.2 41.4
Method Information Index Components    
Percent of current users who were informed about other methods 43.0 49.6
Percent of current users who were informed about side effects 36.7 41.2
Percent of current users who were told what to do if they experienced side effects 82.3 83.8
Percent of current users who would return and/or refer others to their provider 68.8 74.5
Percent of women receiving family planning information in the past 12 months 9.6 12.2
Service Environment:
Charging fees for family planning    
Contraceptive choice: Availability of at least 3 or at least 5 modern contraceptive methods    
Contraceptive choice: Availability of modern contraception, by method    
Contraceptive stock-outs, by method    
Number of new and continuing family planning visits, by method    

The PMA2016/Lagos-R3 Survey in Detail

Sample Design

Round 1 Sample Design

In Nigeria, the PMA2020 survey collects data at the state-level to allow for the estimation of key indicators to monitor progress in family planning - both at the population and the service delivery points (SDPs) levels. The resident enumerator (RE) model enables replication of the surveys twice a year for the first two years, and annually each year after that, to track progress.

For the first round of data collection in the Lagos state (PMA2014/Lagos), the sample was designed to provide state-level estimates without urban-rural stratification, since the state is predominantly urban, using a two-­stage cluster design. First, the primary sampling unit were selected systematically with probability proportional to size. The master frame of Enumeration Areas (EAs) was based on the 2006 Nigerian population census. Census enumeration areas in Nigeria are on average 47 households in size. In order to obtain an enumeration area of approximately 200 households, a cluster of EAs was constructed – hereinafter referred to as EA cluster. An index enumeration area, along with a list of contiguous EAs and associated sampling probabilities, were provided by the National Population Commission (NPopC). Enumeration areas were combined into EA clusters - primary sampling units in Nigeria - and sampling probabilities were adjusted. A 39 EA clusters were selected in Lagos.

In each selected EA cluster, all households, health SDPs, and key landmarks in the EA cluster were listed and mapped by trained REs to create a sampling frame for the second stage of the sampling process. Once listed, field supervisors systematically selected 35 households using a random number-generating mobile-phone application. All eligible women in selected households were approached and asked to provide informed consent to participate in the survey.

For the SDP survey, up to three private SDPs, including pharmacies, within each sampled EA cluster boundary were randomly selected from the listing. In addition, three public health SDPs—a health post, a health center, and a district hospital designated to serve the enumeration area population—were selected.

Round 3 Sample Design

In the second round of data collection in Lagos, 13 additional EA clusters were included in the sample.

Data collection for Round 3 continued in the same set of 52 EAs selected in Round 2. Mapping and listing in PMA2020 is generally done on an annual basis (typically during the first and third rounds), but due to delays in fieldwork, Round 2 occurred approximately one year after Round 1 and thus, listing of households was redone in Round 2. Round 3, conducted six months later, used the Round 2 listing. Field supervisors randomly selected 40 households from the updated household listing. A household roster was completed and all eligible women age 15-49 in selected households were approached and asked to provide informed consent to participate in the study.

The majority of SDPs are repeated in each round, forming a panel survey. If an EA had more than three private SDPs identified during the listing process, then a new sample of the private SDPs is selected during each round.


PMA2020 uses standardized questionnaires to gather data about households and individual females that are comparable across program countries and consistent with existing national surveys. Prior to launching the survey in each country, local experts review and modify these questionnaires to ensure all questions are appropriate to each setting. All female questionnaires were translated into the local languages, and translations were reviewed for appropriateness.

The household, female, and the service delivery point (SDP) questionnaire) were based on model surveys designed by PMA2020 staff at the Bill & Melinda Gates Institute for Population and Reproductive Health at the Johns Hopkins Bloomberg School of Public Health in Baltimore, Maryland, USA, the Center for Evaluation Resources and Development (CRERD), Bayero University Kano (BUK), and fieldwork materials of the Nigeria Demographic and Health Survey (DHS).

All PMA2020 questionnaires are administered using Open Data Kit (ODK) software and Android smartphones. The PMA2016/Lagos-R3 questionnaires were in English and could be switched into local languages (Hausa, Igbo, Pidgin, and Yoruba) on the phone. The questionnaires were translated using available translations from similar population surveys and experts in translation. The interviews were conducted in the local language, or English in a few cases when the respondent was not comfortable with the local language. Female resident enumerators in each enumeration area (EA) administered the household and female questionnaires in the selected households.

The household questionnaire gathers basic information about the household, such as ownership of livestock and durable goods, as well as characteristics of the dwelling unit, including wall, floor and roof materials, water sources, and sanitation facilities. This information is used to construct a wealth quintile index.

The first section of the household questionnaire, the household roster, lists basic demographic information about all usual members of the household and visitors who stayed with the household the night before the interview. This roster is used to identify eligible respondents for the female questionnaire. In addition to the roster, the household questionnaire also gathers data that are used to measure key water, sanitation, and hygiene (WASH) indicators, including regular sources and uses of WASH facilities used and prevalence of open defecation by household members.

The female questionnaire is used to collect information from all women age 15 to 49 who were listed on the household roster at selected households. The female questionnaire gathers specific information on: education; fertility and fertility preferences; family planning access, choice and use; quality of family planning services; and exposure to family planning messaging in the media.

The SDP questionnaire collected information about the provision and quality of reproductive health services and products, integration of health services, and water and sanitation within the SDP.

Training, Data Collection and Processing


The PMA2016/Lagos-R3 fieldwork training started with a centralized training of field supervisors and central staff in Spring 2016. The training was led by PMA2020 staff from the Center for Research, Evaluation Resources, and Development (CRERD) and Bayero University Kano (BUK), with support from the Bill & Melinda Gates Institute for Population and Reproductive Health at the Johns Hopkins Bloomberg School of Public Health. Field supervisors, supported by the central team and PMA2020 team, then became the trainers for the subsequent resident enumerator (RE) training sessions that took place before the start of data collection.

Throughout the training, resident enumerators (REs) and supervisors were evaluated based on their performance on phone-based assessments. The RE training was conducted primarily in Yoruba and English, whereas some small group review sessions were conducted in other local languages.

Supervisors received additional training prior to and after the RE training to further strengthen their supervision skills, including instruction on conducting re-interviews, carrying out random spot checks, and dealing with the local/community leaders and engaging the communities.

Data Collection and Processing

Data collection was conducted between May and June 2016. Unlike traditional paper-and-pencil surveys, PMA2020 uses Open Data Kit (ODK) Collect, an open-source software application, to collect data on mobile phones. All the questionnaires were programmed using this software and installed onto all project smartphones. The ODK questionnaire forms are programmed with automatic skip-patterns and built-in response constraints to reduce data entry errors.

The ODK application enabled REs and supervisors to collect and transfer survey data to a central ODK Aggregate cloud server. This instantaneous aggregation of data also allowed for concurrent data processing and course corrections while PMA2020 was still active in the field. Throughout data collection, central staff at CRERD in Nigeria, and the data manager at the Gates Institute at Johns Hopkins in Baltimore, Maryland routinely monitored the incoming data and notified field staff of any potential errors, missing data or problems found with form submissions on the central server. The use of mobile phones combined data collection and data entry into one step; therefore, data entry was completed when the last interview form was uploaded at the end of data collection in June.

Once all data were on the server, data analysts cleaned and de-identified the data, applied survey weights, and prepared the final dataset for analysis using Stata. The findings were shared with government and community stakeholders at a dissemination event on October 25, 2016.

Response Rates

The table below shows response rates of household and female respondents for the PMA2016/Lagos-Round 3 survey. Of the 2,080 households selected 1,892 (91.0%) households were occupied at the time of the fieldwork. Among the 1,892 potential respondents, 1,727 consented to the household interview (91.3% response rate).

In the selected households 1,512 eligible women aged 15 to 49 years were identified and 1,432 of them were interviewed (response rate of 94.7%).

Result   Urban Rural Total
Household interviews              
Households selected   2,080 -- 2,080
Households occupied   1,892 -- 1,892
Households interviewed   1,727 -- 1,727
Household response rate* (%)   91.3 -- 91.3
Interviews with women age 15-49
Number of eligible women**   1,512 -- 1,512
Number of eligible women interviewed   1,432 -- 1,432
Eligible women response rate (%)   94.7 -- 94.7
*Household response rate = households completed/households occupied

**Eligible women response rates include only women identified in completed household interviews

Eligible response rate = eligible women interviewed/eligible women

Sample Error Estimates

The following table shows sample errors for the PMA2020 indicators described above. For more information about PMA2020 indicators, including estimate type and base population, click here.

Variable Value[R] Standard Error Confidence Interval
All women age 15-49
Currently using a modern method 0.197 0.012 0.173 0.221
Currently using a traditional method 0.068 0.010 0.047 0.088
Currently using any contraceptive method 0.265 0.019 0.227 0.302
Currently using injectables 0.030 0.005 0.021 0.039
Currently using male condoms 0.088 0.011 0.067 0.109
Currently using implants 0.009 0.002 0.005 0.014
Chose method by self or jointly in past 12 months 0.869 0.024 0.821 0.916
Paid fees for family planning services in past 12 months 0.370 0.035 0.299 0.441
Informed by provider about other methods 0.422 0.034 0.354 0.490
Informed by provider about side effects 0.335 0.044 0.246 0.424
Satisfied with provider: Would return and refer friend/relative to provider 0.702 0.037 0.627 0.777
Visited by health worker who talked about family planning in past 12 months 0.111 0.025 0.061 0.160
Women in union age 15-49
Currently using a modern method 0.231 0.017 0.196 0.265
Currently using a traditional method 0.096 0.017 0.063 0.130
Currently using any contraceptive modern method 0.327 0.024 0.279 0.375
Currently using injectables 0.047 0.008 0.032 0.062
Currently using male condoms 0.081 0.004 0.007 0.022
Currently using implants 0.015 0.004 0.007 0.022
Chose method by self or jointly in past 12 months 0.894 0.025 0.843 0.945
Paid fees for family planning services in past 12 months 0.380 0.036 0.308 0.453
Informed by provider about other methods 0.502 0.044 0.413 0.591
Informed by provider about side effects 0.387 0.046 0.294 0.480
Satisfied with provider: Would return and refer friend/relative to provider 0.740 0.044 0.652 0.827
Visited by health worker who talked about family planning in past 12 months 0.136 0.030 0.076 0.196