Table 1. Demographic Information by ROP Type.
| No. (%) | P valuea | ||||
|---|---|---|---|---|---|
| Total cohort (N = 1234) | No ROP (n = 928) | Low-grade ROP (n = 206) | Type 1 ROP (n = 100) | ||
| Gestational age, median (IQR), wk | 29 (26.86-30.71) | 29.7 (28.1-31.0) | 26.6 (25.0-28.5) | 25.3 (24.1-26.0) | <.001 |
| Birth weight, median (IQR), g | 1150 (870-1390) | 1245 (1021-1435) | 833 (671-1087) | 680 (585-780) | <.001 |
| Sex | .10 | ||||
| Male | 637 (52) | 495 (53.3) | 97 (47.1) | 45 (45.0) | |
| Female | 597 (48) | 433 (46.7) | 109 (52.9) | 55 (55.0) | |
| Diagnosis of BPD | 388 (31) | 187 (20.2) | 125 (60.7) | 76 (76.0) | <.001 |
| Household income, median (IQR), thousands of dollars/yb | 75.71 (51.85-95.7) | 78.5 (54.7-96.6) | 64.6 (49.1-97.3) | 55.1 (45.9-77.8) | <.001 |
| Health insurance | <.001 | ||||
| Public | 473 (38) | 307 (33.1) | 105 (50.9) | 61 (61.0) | |
| Private | 761 (62) | 621 (66.9) | 101 (49.0) | 39 (39.0) | |
| Race and ethnicity | <.001 | ||||
| Hispanic | 340 (28) | 227 (24.5) | 66 (32.0) | 47 (47.0) | |
| Non-Hispanic Asian | 117 (9) | 96 (10.3) | 13 (6.3) | 8 (8.0) | |
| Non-Hispanic Black | 219 (18) | 165 (17.8) | 41 (19.9) | 13 (13.0) | |
| Non-Hispanic White | 463 (38) | 376 (40.5) | 66 (32.0) | 21 (21.0) | |
| Unknown/other | 95 (8) | 64 (6.9) | 20 (9.7) | 11 (11.0) | |
Abbreviations: BPD, bronchopulmonary dysplasia; ROP, retinopathy of prematurity.
a
A Fisher exact test was used to calculate P values comparing categorical variables summarized by No. (%), and a Kruskal-Wallis test was used to compare continuous variables summarized by median and IQRs across levels of ROP diagnosis.
b
Data provided by the US Census Bureau was used for median household income by each reported zip code.