1301 women met the inclusion criteria Negative random glucose test-1264 Positive random glucose test-37 Unknown 50g glucose challenge test-20 Negative 50g glucose challenge test-1097 Positive 50g glucose challenge test-147 Negative 50g glucose challenge test-17 Positve 50g glucose challenge test-20 Negative OGTT-3(19) Positive OGTT-1(1) Unverified OGTT-16(0) Negative OGTT-159(1084) Positive OGTT-13(13) Unverified OGTT-925(0) Negative OGTT-97(120) Positive OGTT-27(27) Unverified OGTT-23(0) Negative OGTT-8(16) Positive OGTT-1(1) Unverified OGTT-8(0) Negative OGTT-9(14) Positive OGTT-4(6) Unverified OGTT-7(0)

Table 3: Screening and diagnostic test results before and after correction for verification bias. The figures in the table represent the number of women with the specific combination of test results before (after) correction of verification bias. Figures between parentheses represent the number of women after correction for verification bias.