TABLE 1. Characteristics of study population by BMI category.
| MEN | |||||||
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| 25 to < 30 kg/m2 n = 21,998 | 30 to < 35 kg/m2 n = 18,874 | 35 to < 40 kg/m2 n = 7,353 | 40 to < 45 kg/m2 n = 2,460 | 45 to < 50 kg/m2 n = 820 | 50+ kg/m2 n = 415 | p [note 1] | |
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| Age (yrs) [note 2] mean (SD) |
61.9 (11.3) | 59.0 (11.0) | 55.3 (10.9) | 52.3 (10.6) | 50.7 (9.8) | 48.8 (9.6) | −0.26 (< 0.0001) |
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| HbA1c (%) | |||||||
| mean (SD) | 8.02 (2.06) | 7.97 (1.95) | 8.03 (1.92) | 8.11 (1.88) | 8.12 (1.84) | 8.37 (2.08) | 0.02 (< 0.0001) |
| mmol/mol | 64 | 64 | 64 | 65 | 65 | 68 | |
| p [note 3] | |||||||
| Smoking status: | 25.9 | 24.3 | 24.6 | 23.5 | 22.0 | 21.1 | <0.0001 |
| % current | 39.8 | 42.0 | 39.7 | 35.5 | 31.0 | 32.2 | |
| % former | 34.3 | 33.8 | 35.8 | 41.0 | 47.0 | 46.7 | |
| % never | |||||||
| WOMEN | |||||||
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| 25 to < 30 kg/m2 n = 14,249 | 30 to < 35 kg/m2 n = 13,871 | 35 to < 40 kg/m2 n = 8,379 | 40 to < 45 kg/m2 n = 4,021 | 45 to < 50 kg/m2 n = 1,614 | 50+ kg/m2 n = 1,003 | p [note 1] | |
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| Age (yrs)[note 2]mean (SD) | 65.8 (11.3) | 62.3 (11.5) | 58.7 (11.7) | 55.9 (11.2) | 53.3 (10.8) | 51.0 (10.4) | −0.33 (< 0.0001) |
| HbA1c (%) | |||||||
| mean (SD) | 8.00 (2.05) | 7.92 (1.96) | 7.89 (1.88) | 7.96 (1.84) | 7.91 (1.75) | 7.91 (1.70) | 0.00 (0.69) |
| mmol/mol | 64 | 63 | 63 | 64 | 63 | 63 | |
| p [note 3] | |||||||
| Smoking status: | 24.6 | 23.4 | 23.3 | 23.0 | 23.4 | 21.5 | 0.01 |
| % current | 29.5 | 31.0 | 30.1 | 31.0 | 29.6 | 28.6 | |
| % former % never |
45.9 | 45.6 | 46.6 | 46.0 | 47.0 | 49.9 | |
NOTES: 1) Rank correlation of row variable with BMI (correlation coefficient followed by p value).
2)Within one year of diagnosis with diabetes.
3)Value returned by Mantel-Haenszel chi-square test (alternative hypothesis is linear association between row variable and column variable). Smoking status assumed to reflect approximate degree of exposure i.e. ‘never’ < ‘former’ < ‘current’