BMI categories | South Asians (SA) | Pima | Incidence rate ratio | Incidence risk difference | ||||
New cases | PYR | Incidence (95% CI)* | New cases | PYR | Incidence (95% CI)* | Pima vs South Asians (ref) | Pima minus South Asians | |
Men | ||||||||
<25 | 68 | 6622 | 10.6 (8.1 to 13.1) | 1 | 503 | 2.0 (0 to 6.0) | 0.19 (0, 1.12) | −8.3 (–12.9, –3.7) |
25–29.9 | 62 | 2846 | 20.6 (15.4 to 25.8) | 21 | 1314 | 15.9 (9.1 to 22.7) | 0.73 (0.42, 1.22) | −5.8 (–14.5, 2.9) |
≥30 | 36 | 752 | 45.6 (30.6 to 60.5) | 154 | 3159 | 48.1 (40.4 to 55.8) | 1.02 (0.7, 1.51) | 0.9 (–16.6, 18.3) |
Women | ||||||||
<25 | 52 | 6774 | 8.3 (6.0 to10.6) | 5 | 591 | 8.9 (1.1 to 16.9) | 1.10 (0.34, 2.74) | 0.8 (–6.9, 8.5) |
25–29.9 | 91 | 4705 | 18.2 (14.5 to 22) | 31 | 1453 | 20.8 (13.5 to 28.1) | 1.10 (0.71, 1.67) | 2.0 (–6.5, 10.5) |
≥30 | 98 | 2610 | 34.1 (27.2 to 40.9) | 298 | 6076 | 46.5 (40.9 to 52.0) | 1.31 (1.04, 1.66) | 11.5 (2.2, 20.8) |
IRR (ratio of incidence rates) calculated as Pima (incidence rate) divided by SA (incidence rate). IRD (risk difference, cases/1000 person years) calculated as Pima (incidence rate) minus SA (incidence rate).
Incidence rate ratio and incidence risk difference calculated from crude incidence rates.
Diabetes defined as FPG≥7.00 mmol/L (126 mg/dL) or HbA1c ≥ 48 mmol/mol (6.5 %) or self-reported/physician diagnosed diabetes or medication.
*Age adjusted.
BMI, body mass index; FPG, fasting plasma glucose; HbA1c, glycated hemoglobin; IRD, incidence risk difference; IRR, incidence rate ratio; PYR, person years; ref, reference category.