Effects of Age and Sex on Estimated Diabetes Prevalence Using Different Diagnostic Criteria: The Tromsø OGTT Study

Table 1

Number of participants planned to participate, invited to participate, attended, and completed OGTT in the Tromsø OGTT Study.

HbA1c level in the sixth Tromsø	Number of subjects
study survey (2007-2008)	Planned to participate	Invited to participate	Attended OGTT	Completed OGTT
5.3%	200	309	180	176
5.4%	200	308	195	194
5.5%	100	144	109	107
5.6%	100	164	128	123
5.7%	100	157	115	112
5.8–6.9%	All	3311	2793	2764
Total		4393	3520	3476

Abbreviations: Haemoglobin A_1c, HbA_1c; oral glucose tolerance test, OGTT.
The table summarises how many subjects were planned to participate in the OGTT Study, how many were invited to OGTT, how many attended, and how many who completed OGTT at different HbA_1c levels and in total.