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Table 2 Sample size calculation for unmatched case-control study by open Epi software [18]

From: The determinants of 5th minute low Apgar score among newborns who delivered at public hospitals in Hawassa City, South Ethiopia

No

Variables

Proportion

of controls with exposure

Proportion of

cases with exposure

95 %CI

OR

Sample size

Ref

1.

Meconium stained liquor

25.1 %

40.13 %

2(1.2–2.9)

Cases: 122

[19]

Control: 243

Total: 365

2.

Operative delivery

45.7 %

62.73 %

2(1.02–3.11)

Cases: 109

[20]

Control: 218

Total:327

3.

Induction/augmentation

59.3 %

87.6 %

4.85(1.71,13)

Cases:34

[11]

   

Control:68

Total:102