Table 1.

Glucose tolerance status in 30,383 people screened by the DPP who underwent OGTT by source of data

Glucose tolerance*	Local glucose data only†	CBL results available	Total
Low risk	10,342 (82.8)	7,846 (43.9)	18,188 (59.8)
High risk (IGT − EFG)	966 (7.7)	7,294 (40.8)	8,260 (27.2)
Diabetes	118 (9.5)	2,753 (15.4)	3,935 (13.0)
Total	12,490 (100.0)	17,893 (100.0)	30,383 (100.0)‡

Data are n (%). Results limited to initial OGTTs only.

^*“Low risk” indicates fasting glucose < 95 mg/dl or 2-h glucose > 140 mg/dl. “High risk” indicates fasting glucose 95–125 and 2-h glucose 140–199 mg/dl, i.e., IGT − EFG. “Diabetes” indicates fasting plasma glucose ≥ 126 mg/dl or a 2-h plasma glucose ≥ 200 mg/dl.

^†Based on linear prediction models developed from the group with CBL results. See online appendix Table 2 for regression details.

^‡The total number of OGTTs shown here (30,383) is slightly smaller than the total shown in Fig. 1 (30,996). The difference (613) is related to the exclusion from this table of incomplete OGTTs (e.g., test begun, but no 2-h sample obtained).