The symptoms considered for ARI were cough, difficult breathing, sore throat, running nose, fever and ear pain. Under five group was a part of the whole population and a special care was taken to collect information about the same. The data on demographic characteristics, housing and living conditions and other socio-economic characteristics was recorded. The period of data collection was from October 1995 to June 1996. Diagnosis of ARI was made on symptoms only as narrated by the respondents and may not reflect the true ARI status in some cases.
Data is proper for studying factors associated with the diseases.
Factor Analysis Technique was used for identification of factors. Colonies having similar conditions were grouped to form clusters for providing better estimates of ARI as colony wise cases were small in number. The number of houses, subjects and child-ren covered cluster wise are given in Table I . The overall prevalence of ARI among underfives was estimated to be around 4.5 per cent for a period of one month in the colonies under study. The prevalence during a period of one month was 3.9, 3.0, 5.2 and 6.5 per cent for RC, NS, IC and UC clusters, respectively.