Included in the study were 390 controls and 386 cases of
asthma. Among recruited cases 95 (24.6%) had mild intermittent,
235 (60.9%) had mild persistent and 56 (14.5%) had
moderate persistent asthma. The baseline characteristics are
given in Table 1. Average number of patients recruited per
month is shown in Fig. 1. On an average, maximum patients
were recruited in month of, July (N ¼ 29), March (N ¼ 24) and
August (N ¼ 23). Least number of patients was recruited in the
month February (N ¼ 5).