Table 1.
Description of the study material, organized by month and season.
| OGTT n |
GDM n (%) |
2-h glucose, mmol/L Mean (SD) | Age, years, mean (SD) | Temperature, °C, mean | |
|---|---|---|---|---|---|
| Month | |||||
| January | 1 094 | 36 (3.3) | 6.4 (1.3) | 30.4 (5.0) | 0 |
| February | 928 | 34 (3.7) | 6.4 (1.3) | 30.1 (5.3) | −0.6 |
| March | 1 082 | 31 (2.9) | 6.4 (1.2) | 30.1 (5.2) | 2.4 |
| April | 1 027 | 34 (3.3) | 6.5 (1.3) | 30.1 (5.0) | 7.5 |
| May | 1 057 | 41 (3.9) | 6.5 (1.4) | 30.4 (5.1) | 12.1 |
| June | 1 009 | 59 (5.8) | 6.6 (1.4) | 29.8 (5.1) | 15.2 |
| July | 974 | 50 (5.1) | 6.6 (1.3) | 30.0 (5.0) | 17.7 |
| August | 928 | 52 (5.6) | 6.6 (1.3) | 29.6 (5.0) | 17.6 |
| September | 781 | 33 (4.2) | 6.5 (1.3) | 29.5 (5.3) | 14.4 |
| October | 835 | 42 (5.0) | 6.6 (1.3) | 29.6 (5.1) | 8.4 |
| November | 897 | 38 (4.2) | 6.6 (1.3) | 29.6 (5.2) | 5.3 |
| December | 926 | 37 (4.0) | 6.5 (1.3) | 29.8 (5.1) | 2.9 |
| Season | |||||
| Winter | 2 948 | 107 (3.6) | 6.4 (1.3) | 30.1 (5.1) | 0.7 |
| Spring | 3 166 | 106 (3.3) | 6.5 (1.3) | 30.2 (5.1) | 7.3 |
| Summer | 2 911 | 161 (5.5) | 6.6 (1.4) | 29.8 (5.0) | 16.8 |
| Autumn | 2 513 | 113 (4.5) | 6.6 (1.3) | 29.6 (5.2) | 9.2 |
GDM, gestational diabetes mellitus; OGTT, oral glucose tolerance test; SD, standard deviation.