Characteristics of the eight studies that evaluated low weight gain as a risk factor for ROP.

∧Exclusive of birthweight and gestational age at birth.*Online algorithm that calculates difference between expected “safe” weight gain and actual weight gain; an alarm occurs if the accumulated values exceed a limit.15,16.**Calculated probability of severe ROP based on risk score incorporating GA, BW, and weight gain rate (g/d).***[1000×((weight28-weight7)/weight7)/(28-7)] = g/kg/day.* 排除出生体重与出生胎龄。 * 在线算法：计算预期"安全"体重增长与实际体重增长的差值；若累计值超出限值则触发警报。参考文献15、16。 ** 基于纳入胎龄（Gestational Age，GA）、出生体重（Birth Weight，BW）与体重增长率（g/d）的风险评分，计算重度早产儿视网膜病变（Retinopathy of Prematurity，ROP）的发生概率。 *** 计算公式：[1000×((28天体重-7天体重)/7天体重)/(28-7)] = 克/千克/天。