Table 1 Patient characteristics according to duration of ritodrine hydrochloride infusion
Total | Duration of ritodrine hydrochloride infusion | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
≤48 h | 3–6 days | 7–13 days | 14–27 days | ≥28 days | ||||||||
Number of patients | 4048 | 1472 | (36.4) | 831 | (20.5) | 488 | (12.1) | 570 | (14.1) | 687 | (17.0) | |
Age (years), mean (SD) | < 20 | 80 | 33 | (41.3) | 14 | (17.5) | 3 | (3.8) | 15 | (18.8) | 15 | (18.8) |
20–24 | 358 | 137 | (38.3) | 77 | (21.5) | 40 | (11.2) | 53 | (14.8) | 51 | (14.2) | |
25–29 | 962 | 358 | (37.2) | 214 | (22.2) | 106 | (11.0) | 132 | (13.7) | 152 | (15.8) | |
30–34 | 1388 | 502 | (36.2) | 269 | (19.4) | 180 | (13.0) | 191 | (13.8) | 246 | (17.7) | |
35–39 | 1015 | 347 | (34.2) | 210 | (20.7) | 130 | (12.8) | 147 | (14.5) | 181 | (17.8) | |
≥40 | 245 | 95 | (38.8) | 47 | (19.2) | 29 | (11.8) | 32 | (13.1) | 42 | (17.1) | |
BMI (kg/m2) | < 18.5 | 230 | 79 | (34.3) | 42 | (18.3) | 29 | (12.6) | 35 | (15.2) | 45 | (19.6) |
18.5–24.9 | 2752 | 979 | (35.6) | 556 | (20.2) | 334 | (12.1) | 413 | (15.0) | 470 | (17.1) | |
25.0–29.9 | 731 | 273 | (37.3) | 172 | (23.5) | 93 | (12.7) | 78 | (10.7) | 115 | (15.7) | |
≥30.0 | 184 | 78 | (42.4) | 31 | (16.8) | 18 | (9.8) | 25 | (13.6) | 32 | (17.4) | |
Smoking | No | 3136 | 1101 | (35.1) | 636 | (20.3) | 392 | (12.5) | 459 | (14.6) | 548 | (17.5) |
Yes | 366 | 128 | (35.0) | 74 | (20.2) | 47 | (12.8) | 52 | (14.2) | 65 | (17.8) | |
Multiple births | No | 3631 | 1371 | (37.8) | 760 | (20.9) | 445 | (12.3) | 482 | (13.3) | 573 | (15.8) |
Yes | 417 | 101 | (24.2) | 71 | (17.0) | 43 | (10.3) | 88 | (21.1) | 114 | (27.3) | |
PROM | No | 2568 | 744 | (29.0) | 454 | (17.7) | 330 | (12.9) | 439 | (17.1) | 601 | (23.4) |
Yes | 1480 | 728 | (49.2) | 377 | (25.5) | 158 | (10.7) | 131 | (8.9) | 86 | (5.8) | |
Placenta previa | No | 3783 | 1425 | (37.7) | 803 | (21.2) | 443 | (11.7) | 501 | (13.2) | 611 | (16.2) |
Yes | 265 | 47 | (17.7) | 28 | (10.6) | 45 | (17.0) | 69 | (26.0) | 76 | (28.7) | |
HDP | No | 3925 | 1430 | (36.4) | 810 | (20.6) | 465 | (11.8) | 553 | (14.1) | 667 | (17.0) |
Yes | 123 | 42 | (34.1) | 21 | (17.1) | 23 | (18.7) | 17 | (13.8) | 20 | (16.3) | |
GDM | No | 3897 | 1435 | (36.8) | 806 | (20.7) | 470 | (12.1) | 542 | (13.9) | 644 | (16.5) |
Yes | 151 | 37 | (24.5) | 25 | (16.6) | 18 | (11.9) | 28 | (18.5) | 43 | (28.5) | |
GA (weeks), mean (SD) | 29.9 | (3.2) | 29.0 | (3.3) | 28.1 | (3.4) | 27.9 | (3.1) | 26.0 | (2.7) | ||