Table 1.

District-wise distribution of collected data

District	Control group	Disease group	Sample size
Bajaur	10	20	30
Buner	21	13	34
Kohistan	13	7	20
Lower Dir	16	17	33
Malakand	11	2	13
Shangla	18	17	35
Swat	8	75	83
Upper Dir	16	11	27
Total	113	162	275