**4. Methods**

The survey design was used in this study. According to Kerlinger [16], a survey is the best research design for obtaining social facts, beliefs, and attitudes for both large and small populations to discover relative distribution and interrelation of sociological and psychological variables. Survey uses questionnaires, likewise, our study used questionnaires to obtain the data. Also, the survey has an interview, hence this study also uses key informant interviews to generate information to support data obtained from the questionnaire. In other words, this study employed a mixed research approach that is both quantitative and qualitative [16].

The quantitative data were obtained from the population of healthcare facilities' staff of 27 NHIS accredited hospitals and clinics in Yobe State. Convenient sampling was employed to select two officials in each of the healthcare facilities to make the selected 54 officials. Hence, 54 closed-ended questionnaires were distributed to the healthcare officials who are mostly the Medical Directors and the NHIS Desk Officers. Out of 54 questionnaires administered, 44 were successfully returned, which represents an 81.48% response rate.

The distributed questionnaires were used to gather data on the effect of capitation on revenue generation, efficient use of resources by the healthcare providers, and the data of whether the capitation payment is sustainable or not.

#### *An Assessment of the Effect National Health Insurance Scheme Capitation Payment… DOI: http://dx.doi.org/10.5772/intechopen.102545*

Another questionnaire was used to obtain information regarding enrollee's satisfaction. This questionnaire instrument was administered to determine whether the enrollees were satisfied with the services of healthcare facilities or not. Prior to the distribution of this questionnaire, the sample size in this study was determined to be approximately 32,000 NHIS enrollees. By using a Survey Monkey sample size calculator, the sampling size arrived at 354 enrollees. Hence, 354 questionnaires were administered to the enrollees in the various healthcare facilities and the NHIS office of Yobe State. Out of the 354 administered questionnaires, 343 represent 96.89% response rate.

Moreover, qualitative data were obtained through the key informant interviews conducted with the 7 officials of the NHIS Yobe State Office.

The information obtained in these interviews was mainly used to support the quantitative data obtained from the questionnaires already administered. Also, the information regarding the challenges of the capitation payment system to healthcare facilities was obtained through key informant interviews.

For the data interpretation and analysis, descriptive statistics have been employed, that is to say, the data were presented using tables with frequencies and percentages. In the case of qualitative data, except on the information regarding the challenges of capitation payment, narrative statements of the key informant interview respondents' were directly presented to support or juxtapose the quantitative data that had already been presented.
