Table 1 Characteristics of the study population by maternal age groups.
From: Pregnancy Outcomes in Women of Advanced Maternal Age: a Retrospective Cohort Study from China
Characteristic | Maternal age (years) | |||
|---|---|---|---|---|
Group1 20–29 (N = 700) | Group2 30–34 (N = 700) | Group3 35–39 (N = 700) | Group4 ≥40 (N = 700) | |
Age (y), mean (SD) | 26.05 ± 2.48 | 32.31 ± 1.28 | 36.70 ± 1.37 | 41.14 ± 1.47 |
Gestational weeks (w), mean (SD) | 38.55 ± 2.09 | 38.85 ± 1.64 | 38.55 ± 1.84 | 38.32 ± 2.01 |
Baseline BMI (kg/m2), mean (SD) | ||||
Underweight, n (%) | 194 (27.7) | 109 (15.6) | 58 (8.3) | 55 (7.9) |
Normal, n (%) | 448 (64.0) | 529 (75.5) | 533 (76.1) | 512 (73.1) |
Overweight, n (%) | 53 (7.6) | 53 (7.6) | 76 (10.9) | 103 (14.7) |
Obese, n (%) | 5 (0.7) | 9 (1.3) | 33 (4.7) | 30 (4.3) |
Gravidity, n (%) | ||||
1 | 207 (29.6) | 185 (26.4) | 101 (14.4) | 86 (12.3) |
2 | 237 (33.8) | 209 (29.9) | 158 (22.6) | 129 (18.4) |
≥3 | 256 (36.6) | 306 (43.7) | 441 (63.0) | 485 (69.3) |
Insurance, n (%) | 346 (49.4) | 540 (77.1) | 406 (58.0) | 417 (59.6) |
Education, n (%) | ||||
Low, n (%) | 52 (7.4) | 34 (4.9) | 83 (11.9) | 69 (9.9) |
Middle, n (%) | 203 (29.0) | 163 (23.3) | 324 (46.3) | 380 (54.3) |
High, n (%) | 445 (63.6) | 503 (71.8) | 293 (41.9) | 251 (35.9) |
Area of residence, n (%) | ||||
Metropolitan | 319 (45.5) | 546 (78.0) | 513 (73.3) | 506 (72.3) |
Remote | 179 (25.6) | 99 (14.1) | 110 (15.7) | 86 (12.3) |
Rural | 202 (28.9) | 55 (7.9) | 77 (11.0) | 108 (15.4) |
ART, n (%) | 7 (1.0) | 20 (2.9) | 86 (12.3) | 113 (16.1) |
