Variable Control (non-AH) group (n=1988) AH group (n=497) Chi square p value
Sex
Male 948 238 0.0009 0.976
Female 1040 259
Age (years)
<20 395 98 0.1067 0.991
20-40 894 227
40-60 504 123
>60 195 49
Residential area
Urban 1006 253 0.0049 0.944
Rural 982 244
Socioeconomic status (percentile)
<30 (low) 971 243 0.0134 0.993
30-70 (middle) 193 49
>70 (high) 824 205