Table 1.
Characteristics of the pregnancies in 2000–2014 of diagnosed SLE patients and their population controls in Finland
| Characteristics of pregnancies | SLE n = 163 | Controls n = 580 | p value |
|---|---|---|---|
| Mothers, n | 103 | 371 | |
| Cohabiting, n (%) | 152 (93) | 528 (91) | 0.37 |
| Primipara, n (%) | 74 (45) | 211 (36) | 0.036 |
| Mother’s age at delivery, mean (SD) | 31.2 (4.5) | 31.3 (4.7) | 0.85 |
| Time since index date, months, mean (SD) | 6.2 (3.4) | 5.7 (3.6) | 0.091 |
| Pre-pregnancy weight, kg, mean (SD) | 65.6 (10.6) | 67.2 (14.1) | 0.21 |
| Height, cm, mean (SD) | 166 (6) | 166 (6) | 0.71 |
| Pre-pregnancy body mass index, kg/m2, mean (SD) | 23.8 (3.8) | 24.4 (4.8) | 0.18 |
| < 18.5, n (%) | 2 (1) | 11 (2) | |
| 18.5–24.9, n (%) | 101 (69) | 329 (64) | |
| 25.0–29.9, n (%) | 31 (21) | 116 (22) | |
| ≥ 30, n (%) | 13 (9) | 62 (12) | |
| Smokers, n (%) | 0.28 | ||
| No | 140 (89) | 490 (87) | |
| Quit during the first trimester | 10 (6) | 25 (4) | |
| Continued after the first trimester | 8 (5) | 46 (8) | |
| Education level, n (%) | 0.13 | ||
| Basic | 67 (41) | 272 (47) | |
| Secondary | 53 (33) | 183 (32) | |
| High | 43 (26) | 125 (22) |
SLE systemic lupus erythematosus, n number, % percentage, SD standard deviation, index date the date of special reimbursement decision for SLE medication in patients (equal with the inclusion of controls), kg kilograms, cm centimetre, m2 square metre