Study area, Design and Population
Facility based cross-sectional study design was conducted from July 15 to October 15, 2019, in Asella Town. Asella is the administrative Town of Asri Zone and located 175 kilo meters to Southeast capital city of Ethiopia, Addis Ababa. The total population of the Town was 110,433 and 24,406 of them was women of child bearing age [18]. According to the Town health office 2019 report, in the Town there are one referral hospital, two health centers, two private hospitals and two nongovernment clinics [19]. A woman who came for abortion service was systematically selected and included in study. However, woman who was critically sick and unable to give the response was excluded.
Sample size determination and Sampling procedure
The sample size was determined using stat calc of Epi Info statistical software Version 7. A 95% confidence level, power of 80%, and an assumption of the ratio of unexposed to exposed equivalent to one was assumed for the calculation. Based on this, the sample size was calculated to be 384. After correction formula was applied and adding 5% non-response rate the final sample size was 279. The women who got the abortion service for the 3 consecutive months, on average, were (N=871) in health facilities which included in the study. From the seven health facilities, four were included in the study. Those were one government Hospital, which was selected purposely because it is the only government hospital in Asella Town, and other study areas were selected by lottery methods one government health center, one private hospital and one NGO clinic. The sample size was allocated proportionally by population size formula based on their client load of three months antecedent for each health facility. The study participants were selected using the systematic sampling technique with the interval of three. The woman who came for abortion service on the first day of data collection was considered as the first respondent and then, each respondent corresponding to the skip interval was selected.
Data collection tool and data collection procedure
Data were collected using structured and pre-tested questionnaire. The tool contained information related to socio-demographic characteristics, health service, reproductive health and personal factors. The questionnaire was initially prepared in English language and then translated into Afan Oromo and Amharic languages. It was translated back to English language to check for any inconsistencies and understandability. One day training was given for both data collectors and supervisors. The training consisted of the purpose of the study, enumeration procedures, and how to conduct interview. After data collection, all completed questionnaires were checked for completeness and cleaned manually.
Data processing and analysis
Data were checked for its completeness, cleaned and entered using Epi Info version 7 and then exported in SPSS version 21 for analysis. Data were analyzed using descriptive statistics and logistic regression. Descriptive statistics such as frequency, mean and standard deviation were computed. From logistic regression, bivariable and multivariable were used. All variables with P-value <0.05 in bivariable analysis were moved to multivariable regression to control confounding effect. Adjusted odds ratios along its 95% confidence interval (95% CI) were used to measure the strength of associations. Variables at p-vale < 0.05 in multivariable logistic regression have been considered as significant association with utilization of post abortion of family planning.