Variable Entonox (n=50) Pethidine   (n=50) P value
Age (year) 7.34 ± 26.2 6.02 ± 27.2 NS
Weight (kg) 0.38 ± 69 11.06 ± 73 NS
Gestation (week) 0.95 ±  38.44 0.92 ± 38.58 NS
Cervical dilation at Analgesic inititation (cm) 0.91 ± 4.46 0.89 ±  4.36 NS

Table 1: Descriptive data of Entonox and pethidine subjects.

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