Abstract #35 Table 1

Characteristics of patients residing in philadelphia who gave birth from Oct 23, 2013 through Oct 22, 2016 (n=19,203) by preterm birth (PTB), spontaneous PTB (sPTB), and medically indicated PTB (mPTB)

Total (n=19,203) Term (n=17,477) sPTB (n=1,070) mPTB (n=656)
n (%) n (%) n (%) Pa n (%) Pa
Age (years) <0.0001 0.0133
< 25 5213 (27.1) 4700 (26.9) 361 (33.7) 152 (23.2)
25 – 34 10579 (55.1) 9675 (55.4) 542 (50.7) 362 (55.2)
≥ 35 3411 (17.8) 3102 (17.7) 167 (15.6) 142 (21.6)
Race/ethnicity* <0.0001 <0.0001
Non-Hispanic white 5344 (27.8) 5018 (28.7) 216 (20.2) 110 (16.8)
Non-Hispanic Black 10195 (53.1) 9065 (51.9) 667 (62.3) 463 (70.6)
Asian 1191 (6.2) 1112 (6.4) 64 (6.0) 15 (2.3)
Hispanic 1618 (8.4) 1493 (8.5) 79 (7.4) 46 (7.0)
Multiracial, other, unknown 855 (4.5) 789 (4.5) 44 (4.1) 22 (3.4)
Insurance status <0.0001 <0.0001
Private 8432 (43.9) 7835 (44.8) 371 (34.7) 226 (34.5)
Public/self-pay/other 10771 (56.1) 9642 (55.2) 699 (65.3) 430 (65.5)
Body mass index (kg/m2) 0.0006 <0.0001
< 25 7733 (40.3) 7144 (40.9) 401 (37.5) 188 (28.7)
≥ 25 – <30 3719 (19.4) 3392 (19.4) 190 (17.8) 137 (20.9)
≥ 30 4256 (22.2) 3776 (21.6) 233 (21.8) 247 (37.7)
Missing 3495 (18.2) 3165 (18.1) 246 (23.0) 84 (12.8)
Parity 0.0221 0.2165
0 8494 (44.2) 7780 (44.5) 438 (40.9) 276 (42.1)
> 0 10709 (55.8) 9697 (55.5) 632 (59.1) 380 (57.9)
Walk Score, mean (SD) 84.9 (9.6) 85.0 (9.7) 84.9 (8.2) 0.9476 83.7 (9.0) 0.0012
Neighborhood deprivation index^, mean (SD) 0.49 (0.14) 0.49 (0.14) 0.51 (0.13) <0.0001 0.52 (0.13) <0.0001
  • aP value compared to term using Chi-square or t-test as appropriate

  • *Race/ethnicity self-identified during patient registration

  • Walk Score ranges: 0-24 (all errands are car dependent), 25-49 (Most errands require a car), 50-69 (some errands can be done by foot), 70-89 (most errands can be done by foot), 90-100 (daily errands do not require a car)

  • ^Neighborhood deprivation index ranges from 0-1 with 0 least deprived and 1 most deprived (includes census tract poverty, education, and vacant housing indicators)