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Table 1 Patient characteristics according to duration of ritodrine hydrochloride infusion

From: Antenatal corticosteroid administration in women undergoing tocolytic treatment who delivered before 34 weeks of gestation: a retrospective cohort study using a national inpatient database

  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)
  1. BMI body mass index, GA gestational age on admission, GDM gestational diabetes mellitus, HDP hypertensive disorders of pregnancy, PROM premature rupture of membrane