From: Colombo Twin and Singleton Study (CoTASS): A description of a population based twin study of mental disorders in Sri Lanka
Characteristic
Consenters N = 3995
Refusers N = 363
Test statistic
P
Age (mean)
33.9
36.2
3.121
<0.01
Sex (% male)
46.2
48.2
0.752
0.45
Ethnicity (% Sinhalese)
90.1
85.7
-2.672
0.01