Variable (Continuous)

n

Mean

SD

Minimum

Maximum

Maternal Age (years)

90

29.1

5.7

19

46

Infant’s weight (gram)

89

3383.4

536.1

2100

4825

Infant’s head circumference (cm)

87

34.2

1.6

30

38

Second stage (minutes)

89

147.2

125.7

5

518

Active pushing (minutes)

76*

105.9

85.8

5

312

Passive pushing (minutes)

76*

44.5

73.2

0

307

Variable (Categorical)

Frequency %

Anal tear

90

27

30.0

Epidural

90

72

80.0

Episiotomy

90

17

18.9

Oxytocin

90

53

58.9

Vacuum

90

5

5.6

Forceps

90

2

2.2