| 变量 | 总体(n = 309) | 验证集(n = 93) | 训练集(n = 216) | P值 |
| 产妇资料 | ||||
| 高龄产妇，n (%) | 117 (38) | 36 (39) | 81 (38) | 0.942 |
| 产前感染，n (%) | 105 (34) | 30 (32) | 75 (35) | 0.773 |
| 妊娠期高血压，n (%) | 121 (39) | 32 (34) | 89 (41) | 0.32 |
| 妊娠期糖尿病，n (%) | 51 (17) | 9 (10) | 42 (19) | 0.051 |
| 顺产，n (%) | 101 (33) | 38 (41) | 63 (29) | 0.06 |
| 孕次，M (Q1, Q3) | 2 (1, 3) | 2 (1, 3) | 2 (1, 3) | 0.573 |
| 产次，M (Q1, Q3) | 2 (1, 2) | 2 (1, 2) | 2 (1, 2) | 0.523 |
| 产前激素使用次数，M (Q1, Q3) | 2 (1, 4) | 2 (1, 4) | 2 (1, 4) | 0.918 |
| 新生儿资料 | ||||
| ROP, n (%) | 109 (35) | 30 (32) | 79 (37) | 0.55 |
| 出生胎龄，周，Mean ± SD | 28.46 ± 1.58 | 28.33 ± 1.50 | 28.52 ± 1.61 | 0.336 |
| 出生体重，g，M (Q1, Q3) | 980 (890, 1100) | 980 (890, 1100) | 985 (890, 1100) | 0.969 |
| 生后体重增加，g/天，M (Q1, Q3) | 15.65 (11.3, 20.43) | 15.65 (11.3, 19.13) | 15.65 (11.74, 20.98) | 0.573 |
| 恢复出生体重时间，M (Q1, Q3) | 10 (7, 13) | 10 (7, 14) | 9 (7, 13) | 0.104 |
| 多胎，n (%) | 74 (24) | 26 (28) | 48 (22) | 0.348 |
| 男性，n (%) | 165 (53) | 45 (48) | 120 (56) | 0.301 |
| PDA, n (%) | 159 (51) | 47 (51) | 112 (52) | 0.93 |
| NRDS, n (%) | 259 (84) | 80 (86) | 179 (83) | 0.602 |
| PPHN, n (%) | 44 (14) | 14 (15) | 30 (14) | 0.927 |
| BIPI, n (%) | 58 (19) | 17 (18) | 41 (19) | 1 |
| PNAC, n (%) | 74 (24) | 18 (19) | 56 (26) | 0.273 |
| 肺炎，n (%) | 206 (67) | 59 (63) | 147 (68) | 0.511 |
| 败血症，n (%) | 93 (30) | 33 (35) | 60 (28) | 0.223 |
| 甲状腺功能减低，n (%) | 115 (37) | 27 (29) | 88 (41) | 0.068 |
| NEC, n (%) | 32 (10) | 12 (13) | 20 (9) | 0.447 |
| 生后窒息，n (%) | 199 (64) | 58 (62) | 141 (65) | 0.718 |
| 出生贫血，n (%) | 64 (21) | 17 (18) | 47 (22) | 0.59 |
| BPD, n (%) | 276 (89) | 82 (88) | 194 (90) | 0.82 |
| 机械通气，n (%) | 104 (34) | 29 (31) | 75 (35) | 0.636 |
| 无创呼吸机 ≥ 2周，n (%) | 252 (82) | 77 (83) | 175 (81) | 0.834 |
| 吸氧 ≥ 2周，n (%) | 202 (65) | 62 (67) | 140 (65) | 0.854 |
| FiO2 ≥ 0.3使用24h以上，n (%) | 156 (50) | 50 (54) | 106 (49) | 0.527 |
| 钙磷补充，n (%) | 196 (63) | 60 (65) | 136 (63) | 0.896 |
| 输血≥3次，n (%) | 171 (55) | 50 (54) | 121 (56) | 0.81 |
| PS治疗，n (%) | 160 (52) | 51 (55) | 109 (50) | 0.561 |
| 激素治疗，n (%) | 78 (25) | 23 (25) | 55 (25) | 1 |
| 利尿剂治疗，n (%) | 95 (31) | 28 (30) | 67 (31) | 0.98 |
| 肠外营养天数，M (Q1, Q3) | 28 (19, 41) | 27 (19, 39) | 28.5 (19, 43.25) | 0.694 |
| 禁食天数，M (Q1, Q3) | 1 (0, 3) | 1 (0, 3) | 1 (0, 4) | 0.831 |
| 咖啡因天数，M (Q1, Q3) | 45 (33, 59) | 45 (33, 58) | 44.5 (34, 59) | 0.751 |
| 肠内微量喂养开始时间，M (Q1, Q3) | 1 (0, 2) | 1 (0, 2) | 1 (0, 2) | 0.542 |