Table 2 |
||||
|
Demographic characteristics: Individuals in the twin sample who consented to participate, compared to those who refused |
||||
|
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 |
|
|
||||
|
1 t-value 2 z-value |
||||
|
Siribaddana et al. BMC Psychiatry 2008 8:49 doi:10.1186/1471-244X-8-49 |
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