Table 1 Distribution of background characteristics by pregnancy outcome
Live or stillbirth (N = 18,186) | Miscarriage (N = 5317) | Induced abortion (N = 3089) | P-value | |
|---|---|---|---|---|
Age, Mean(SD) | 27.9 (5.6) | 28.5 (6.4) | 25.5 (6.3) | < 0.001 |
Marital status, N(%) | < 0.001 | |||
Married or de facto | 13,969 (76.8) | 3678 (69.2) | 1390 (45.0) | |
Other | 4139 (22.8) | 1620 (30.5) | 1687 (55.0) | |
Missing | 78 (0.4) | 19 (0.4) | 12 (0.4) | |
Area of residence, N(%) | 0.002 | |||
Major cities | 9560 (52.6) | 2892 (54.4) | 1687 (54.6) | |
Inner regional | 4982 (27.4) | 1471 (27.7) | 857 (27.7) | |
Outer regional | 2759 (15.2) | 741 (13.9) | 404 (13.1) | |
Remote/very remote | 604 (3.3) | 139 (2.6) | 102 (3.3) | |
Missing | 281 (1.5) | 74 (1.4) | 39 (1.3) | |
Managing on income, N(%) | < 0.001 | |||
Impossible | 352 (1.9) | 127 (2.4) | 95 (3.1) | |
Difficult always | 2118 (11.6) | 656 (12.3) | 525 (17.0) | |
Difficult sometimes | 5543 (30.5) | 1478 (27.8) | 964 (31.2) | |
Not too bad | 6246 (34.4) | 1783 (33.5) | 867 (28.1) | |
It is easy | 2364 (13.0) | 749 (14.1) | 350 (11.3) | |
Missing | 1563 (8.6) | 624 (11.7) | 288 (9.3) | |
Educational level, N(%) | < 0.001 | |||
Less than year 12 | 2111 (11.6) | 598 (11.2) | 478 (15.5) | |
Year 12 or equivalent | 4191 (23.0) | 1291 (24.3) | 1127 (36.5) | |
Certificate/diploma | 4204 (23.1) | 1254 (23.6) | 680 (22.0) | |
University | 7441 (40.9) | 2117 (39.8) | 754 (24.4) | |
Missing | 239 (1.3) | 57 (1.1) | 50 (1.6) | |
Occupation, N(%) | < 0.001 | |||
Manager/professional | 8022 (44.1) | 2436 (45.8) | 1283 (41.5) | |
Semi skilled | 5538 (30.5) | 1619 (30.4) | 1100 (35.6) | |
Unskilled | 1143 (6.3) | 338 (6.4) | 230 (7.4) | |
Not in labour force | 3115 (17.1) | 817 (15.4) | 408 (13.2) | |
Missing | 368 (2.0) | 207 (3.9) | 68 (2.2) | |
Number of previous pregnancies, N(%) | < 0.001 | |||
0 | 7100 (39.0) | 1018 (19.1) | 1095 (35.4) | |
1 | 5748 (31.6) | 1314 (24.7) | 639 (20.7) | |
2+ | 5338 (29.4) | 2985 (56.1) | 1355 (43.9) | |
Smoking status, N(%) | < 0.001 | |||
Never smoker | 10,190 (56.0) | 2716 (51.1) | 1159 (37.5) | |
Former smoking | 4349 (23.9) | 1315 (24.7) | 679 (22.0) | |
Less than 10 cigarettes per day | 1332 (7.3) | 428 (8.0) | 411 (13.3) | |
Between 10 and 19 cigarettes per day | 989 (5.4) | 381 (7.2) | 332 (10.7) | |
20 or more cigarettes per day | 626 (3.4) | 234 (4.4) | 223 (7.2) | |
Current smoker but unknown number of cigarettes per day | 445 (2.4) | 157 (3.0) | 189 (6.1) | |
Missing | 255 (1.4) | 86 (1.6) | 96 (3.1) | |
Body-mass index, N(%) | < 0.001 | |||
Underweight | 751 (4.1) | 246 (4.3) | 172 (5.6) | |
Normal weight | 9602 (52.8) | 2772 (52.1) | 1731 (56.0) | |
Overweight | 3534 (19.4) | 1120 (21.1) | 533 (17.3) | |
Obese | 2045 (11.2) | 794 (14.9) | 316 (10.2) | |
Missing | 2254 (12.4) | 385 (7.2) | 337 (10.9) | |
Alcohol intake, N(%) | < 0.001 | |||
Low risk drinker | 15,307 (84.2) | 4508 (84.8) | 2634 (85.3) | |
Non-drinker | 2172 (11.9) | 509 (9.6) | 196 (6.3) | |
Risky drinker | 584 (3.2) | 259 (4.9) | 233 (7.5) | |
Missing | 123 (0.7) | 41 (0.8) | 26 (0.8) |