Table 1 Comparison of clinical data between the two groups

Gestational age[M(P₂₅ ~ P₇₅)]/weeks

29.14(27.43 ~ 30.86)

29.57(27.86 ~ 31.14)

Z = 0.23

0.714

Birth weight[M(P₂₅ ~ P₇₅)]/g

1270(985.0 ~ 1552.0)

1300(1013.0 ~ 1585.0)

Z = 0.34

0.632

Gender(Male/Female, n)

71/61

55/47

χ² = 0.31

0.787

MBD[n(%)]

10(7.58)

2(1.96)

χ² = 5.53

0.023

High risk of MBD[n(%)]

48(36.36)

6(5.88)

χ² = 9.47

0.016