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Table 2 Demographic characteristics: Individuals in the twin sample who consented to participate, compared to those who refused

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

  1. 1 t-value
  2. 2 z-value