Table 1 Single factor correlation analysis
From: The treatment and risk factors of retinopathy of prematurity in neonatal intensive care units
Items | No. | ROP (+)/case (%) | ROP(−) /case (%) | OR (95%CI) | χ2 | P |
|---|---|---|---|---|---|---|
Gender |  |  |  | 0.956(0.635~ 1.440) | 0.046 | 0.830 |
 F | 256 | 80 (31.25) | 176 (68.75) |  |  |  |
 M | 180 | 58 (32.22) | 122 (67.78) |  |  |  |
Number of fetuses |  |  |  | (not a 2 × 2 table, could not calculate) | 6.689 | 0.035 |
 Single birth | 286 | 96 (33.57) | 190 (66.43) |  |  |  |
 Twin birth | 116 | 27 (23.28) | 89 (76.72) |  |  |  |
 Multiple birth | 34 | 15 (44.12) | 19 (55.88) |  |  |  |
Gestational age |  |  |  | 1.808(1.059~ 3.084) | 4.802 | 0.028 |
  ≤ 32 w | 342 | 117 (34.21) | 225 (65.79) |  |  |  |
 >32 w | 94 | 21 (22.34) | 73 (77.66) |  |  |  |
Birth weight |  |  |  | (not a 2 × 2 table, could not calculate) | 74.550 | 0.000 |
  ≤ 1000 g |  | 0 | 0 |  |  |  |
~ 1500 g | 251 | 117 (46.61) | 134 (53.39) |  |  |  |
~ 2000 g | 109 | 18 (16.51) | 91 (83.49) |  |  |  |
> 2000 g | 76 | 3 (3.95) | 73 (96.05) |  |  |  |
Mechanical ventilation > 96 h |  |  |  | 4.525(2.931~ 6.994) | 49.605 | 0.000 |
 Y | 142 | 77 (54.22) | 65 (45.78) |  |  |  |
 N | 294 | 61 (20.75) | 233 (79.25) |  |  |  |
Intravascular hemolysis |  |  |  | 3.095(2.037~ 4.701) | 29.064 | 0.000 |
 Y | 169 | 79 (46.75) | 90 (53.25) |  |  |  |
 N | 267 | 59 (22.09) | 208 (77.91) |  |  |  |
Number of operation |  |  |  | (not a 2 × 2 table, could not calculate) | 22.246 | 0.000 |
  ≥ 2 | 30 | 13 (43.33) | 17 (56.67) |  |  |  |
 1 | 111 | 54 (48.64) | 57 (51.35) |  |  |  |
 0 | 295 | 74 (25.08) | 221 (74.92) |  |  |  |
Blood culture |  |  |  | 2.299(1.260~ 4.194) | 7.662 | 0.006 |
 Positive | 49 | 24 (48.98) | 25 (51.02) |  |  |  |
 Negative | 387 | 114 (29.46) | 273 (70.54) |  |  |  |