Table 1 Comparison of demographic variables of preterm infants in three groups

Number (%)

Sex

Boy

30(60%)

26(52%)

33(66%)

0.36^b

Girl

20(40%)

24(48%)

17(34%)

Total

50(100%)

50(100%)

50(100%)

Mean ± SD

Gestational age (weeks)

31.76 ± 0.71

31.8 ± 0.78

31.62 ± 0.6

0.4^c

At birth weight (g)

1644 ± 272.4

1639.7 ± 205.89

1632.4 ± 215.59

0.96^c

Age to oral feeding onset (days)

13.8 ± 4.95

12.52 ± 4.52

13.14 ± 5.17

0.42^c

Age at enrollment (days)

5.7 ± 5.72

4.9 ± 5.22

4.76 ± 5.82

0.66^c

Weight at enrollment (g)

1640 ± 265.3

1615.4 ± 210.75

1618 ± 220.38

0.84^c

One-minute Apgar score

7.72 ± 1.53

7.2 ± 0.9

7.52 ± 1.03

0.9^c

Five-minute Apgar score

9.15 ± 1.21

9.18 ± 0.85

9.36 ± 0.87

0.61^c

Age of Discharge time (days)

18.5 ± 4.81

18.22 ± 4.7

20.92 ± 5.03

0.01^c

Duration of hospitalization (days)

25.98 ± 6.78

27.28 ± 6.2

29.36 ± 5.97

0.02^c