Table 4.
The ePTB subgroup predicted /observed probability and maternal characteristics in validation cohort via logistic regression
| Variable | Subgroup | |||
|---|---|---|---|---|
| 1st Quartile | 2nd Quartile | 3rd Quartile | 4th Quartile | |
| N = 299529 | N = 299078 | N = 299993 | N = 299861 | |
| Probability (%) | ||||
| Average Predicted | 1.92 | 2.46 | 3.22 | 6.02 |
| Range Predicted | 0.55 | 0.52 | 0.95 | 60.6 |
| Average Observed | 1.83 | 2.33 | 3.24 | 6.07 |
| Mothers’ Age (%) | ||||
| ≤ 24 Years | 36603 (12.22) | 70681 (23.63) | 127739 (42.58) | 105995 (35.35) |
| 25-29 Years | 120779 (40.32) | 83600 (27.95) | 68003 (22.67) | 71979 (24.00) |
| 30-34 Years | 129538 (43.25) | 78439 (26.23) | 56362 (18.79) | 60927 (20.32) |
| ≥ 35 Years | 12609 (4.21) | 66358 (22.19) | 47889 (15.96) | 60960 (20.33) |
| Mothers’ Race (%) | ||||
| White | 259978 (86.80) | 273311 (91.38) | 260128 (86.71) | 114119 (38.06) |
| Black | 0 (0.00) | 872 (0.29) | 18661 (6.22) | 172970 (57.68) |
| American Indian/Alaskan Native/Asian or Pacific Islander | 39551 (13.20) | 24895 (8.32) | 21204 (7.07) | 12772 (4.26) |
| Marital Status (%) | ||||
| Married | 296804 (99.09) | 246717 (82.49) | 92320 (30.77) | 80790 (26.94) |
| Unmarried | 2725 (0.91) | 52361 (17.51) | 207673 (69.23) | 219071 (73.06) |
| Mothers’ Education (%) | ||||
| ≤ High School or GED/Unknown | 10988 (3.67) | 93778 (31.36) | 192086 (64.03) | 175699 (58.59) |
| Associate/Some College Credit | 69843 (23.32) | 117843 (39.40) | 69455 (23.15) | 79732 (26.59) |
| ≥ Bachelor’s | 217614 (72.65) | 71541 (23.92) | 21886 (7.30) | 35359 (11.79) |
| Missing | 1084 (0.36) | 15916 (5.32) | 16566 (5.52) | 9071 (3.03) |
| Pre-pregnancy Smoking Status (%) | ||||
| Nonsmoker | 295313 (98.59) | 262159 (87.66) | 234907 (78.30) | 217556 (72.55) |
| Smoker/Unknown/Not Stated | 3132 (1.05) | 21003 (7.02) | 48520 (16.17) | 73234 (24.42) |
| Missing | 1084 (0.36) | 15916 (5.32) | 16566 (5.52) | 9071 (3.03) |
| Pre-pregnancy BMI (%) | ||||
| Under Weight-Normal ≤ 24.9 | 183032 (61.11) | 142007 (47.48) | 119757 (39.92) | 108130 (36.06) |
| Overweight 25.0-29.9 | 82956 (27.70) | 67818 (22.68) | 70451 (23.48) | 62770 (20.93) |
| Obesity ≥ 30.0/Unknown/Not Stated | 32457 (10.84) | 73337 (24.52) | 93219 (31.07) | 119890 (39.98) |
| Missing | 1084 (0.36) | 15916 (5.32) | 16566 (5.52) | 9071 (3.03) |
| Pre-pregnancy Diabetes Status (%) | ||||
| No/Unknown/Not Stated | 298445 (99.64) | 283149 (94.67) | 282480 (94.16) | 282746 (94.29) |
| Yes | 0 (0.00) | 13 (0.00) | 947 (0.32) | 8044 (2.68) |
| Missing | 1084 (0.36) | 15916 (5.32) | 16566 (5.52) | 9071 (3.03) |
| Pre-pregnancy Hypertension Status (%) | ||||
| No/Unknown/Not Stated | 298445 (99.64) | 283162 (94.68) | 282293 (94.10) | 273911 (91.35) |
| Yes | 0 (0.00) | 0 (0.00) | 1134 (0.38) | 16879 (5.63) |
| Missing | 1084 (0.36) | 15916 (5.32) | 16566 (5.52) | 9071 (3.03) |
| Previous Preterm Birth Status (%) | ||||
| No/Unknown/Not Stated | 298445 (99.64) | 283162 (94.68) | 283427 (94.48) | 258817 (86.31) |
| Yes | 0 (0.00) | 0 (0.00) | 0 (0.00) | 31973 (10.66) |
| Missing | 1084 (0.36) | 15916 (5.32) | 16566 (5.52) | 9071 (3.03) |
| Infertility Treatment Usage Status (%) | ||||
| No/Unknown/Not Stated | 298445 (99.64) | 283162 (94.68) | 283427 (94.48) | 272918 (91.01) |
| Yes | 0 (0.00) | 0 (0.00) | 0 (0.00) | 17872 (5.96) |
| Missing | 1084 (0.36) | 15916 (5.32) | 16566 (5.52) | 9071 (3.03) |