Q1 Discuss the results presented in table HH.1 and describe the importance of this table in any survey. 

ANS: The survey result indicates a total of 42,981 households were samples and 40,518 interviews (13,455 in Urban and 27,063 in Rural areas) conducted, with a household response rate of 98.7. the survey covered 6 geopolitical zones including North central, North east, North west, South east, South south and South west. Average response rate across the 6 zones is 98.7; with North west and South west zones recording the highest and lowest response rates respectively.

Total eligible children (12 – 23 months) is 6,360 and 6,268 mother/caretakers were interviewed in total. Overall response rate for this category is reported as 97.3

Survey participation was very high, evidenced by the high response rate. By this, survey information will be fully represent the sampled population.

Q2. From tables HH.3 and HH.5, (a) describe the key differences between weighted and unweighted household composition findings. (b) What factors would influence the differences observed between the weighted and unweighted results.

ANS: a)Total households recorded for both weighted and unweighted is equal (40,518 households). However, household characteristics including sex, geopolitical zone, area, education, religion, language etc, clearly indicate differences between weighted and unweighted.
b) In summary, weighted variables are greater than unweighted variables. To this end, the weighting methodology applied in this survey has ensured a higher number of respondents sampled in the survey. This will therefore produce a result that is better representative of the total population.

Q3. The results of table IM.1 are based on a weighted analysis (a) Discuss the findings of table IM.1 (b) How does sample size influence the findings in table IM.1? (c) Describe what would be the key differences in results of table IM.1 if they were computed on the unweighted sample.

a) Six (6) geopolitical zones across Nigeria were covered in the survey, targeting 6,268 eligible children 12 – 23 months vaccinated against vaccine preventable childhood diseases. Targeted vaccines in this survey is pentavalent vaccine 1, 2 & 3. Age bracket for caretakers that participated in the survey is 15 to over 50 years. Majority of the respondents are between 20 – 29 years (2,830), whilst only 122 respondents are over 50 years. The estimated percent of children 12-23 months with evidence of vaccination is observed to be reducing from Penta 1 (49%), Penta 2 (44%) and Penta 3 (33%).
b) The influence of sample size on the findings include: only a proportion of the population has been consider but the weighting methodology resulted in a bigger sample size.
c) If the results were computed on unweighted samples, the would have been far less respondents.

Q4. If a survey has “low” card availability, would you do the analyses that require dates (timelines, simultaneity of vaccines recommended at the same age, missed opportunities) weighted or unweighted? Why? Explain.

ANS: No. this is because the availability of cards will timeliness and contribute to data quality.

(a) With reference to table IM.14 describe key differences between crude and valid coverage. (b) How does card availability (and with dates) influence computation of valid coverage?

Crude is the survey-based estimates of immunization and the valid coverage is also know effective coverage. Whilst the crude coverage is an estimate.
Survey variables without vaccination card to serve as evidence of vaccination, will be difficult to manage during analysis.

Q5. (a) With reference to table IM.14 describe key differences between crude and valid coverage. (b) How does card availability (and with dates) influence computation of valid coverage?

ANS: a) Crude is the survey-based estimates of immunization and the valid coverage is also know effective coverage. Whilst the crude coverage is an estimate.
b) Survey variables without vaccination card to serve as evidence of vaccination, will be difficult to manage during analysis.