Table 2.
Comparison of participant characteristics according to 25-hydroxyvitamin D (25(OH)D) quartiles, SPECT-China 2014 study
| 25(OH)D (nmol/l) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Q1 (19·03–33·69) | Q2 (33·70–39·31) | Q3 (39·32–46·18) | Q4 (46·19–123·73) | P for trend | |||||
| n | 1650 | 1650 | 1647 | 1649 | – | ||||
| Age (years) | 50·7 | 13·9 | 50·7 | 12·8 | 51·9 | 13·2 | 56·6 | 13·1 | <0·002 |
| Men (%) | 33·4 | 38·3 | 52·1 | 46·8 | <0·001 | ||||
| HbA1c (%) | 5·29 | 0·88 | 5·35 | 0·88 | 5·35 | 0·77 | 5·43 | 0·76 | <0·001 |
| Fasting glucose (mmol/l) | 5·64 | 1·31 | 5·61 | 1·30 | 5·61 | 1·25 | 5·60 | 1·14 | 0·32 |
| Fasting insulin (pmol/l) | 43·09 | 41·80 | 39·95 | 29·85 | 39·08 | 30·08 | 37·08 | 33·50 | <0·001 |
| HOMA-IR | 1·63 | 2·12 | 1·48 | 1·39 | 1·45 | 1·38 | 1·37 | 1·53 | <0·001 |
| LDL-C (mmol/l) | 2·89 | 0·73 | 2·97 | 0·74 | 2·96 | 0·71 | 2·89 | 0·70 | 0·92 |
| TAG (mmol/l) | 1·88 | 2·22 | 1·72 | 1·59 | 1·64 | 1·36 | 1·39 | 0·86 | <0·001 |
| HDL-C (mmol/l) | 1·46 | 0·33 | 1·45 | 0·32 | 1·45 | 0·31 | 1·47 | 0·33 | 0·97 |
| WC (cm) | 77·7 | 10·3 | 78·7 | 10·3 | 79·5 | 9·9 | 80·2 | 9·6 | <0·001 |
| BMI (kg/m2) | 23·9 | 3·6 | 24·2 | 3·6 | 24·3 | 3·8 | 24·1 | 3·4 | <0·05 |
| Smoking (%) | 20·9 | 22·3 | 26·8 | 29·0 | <0·001 | ||||
| Drinking (%) | 26·7 | 30·1 | 34·7 | 36·2 | <0·001 | ||||
SPECT-China 2014, Survey on the Prevalence in East China of Metabolic Diseases and Risk Factors, 2014; HbA1c, glycated Hb; HOMA-IR, homeostasis model assessment of insulin resistance; LDL-C, LDL cholesterol; HDL-C, HDL cholesterol; WC, waist circumference.