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Example NNTs - Obstetrics-Gynecology

Condition or Disorder	Intervention vs. Control	Outcome	Follow-up Duration	Event Rates %		NNT (95% CI)
Condition or Disorder	Intervention vs. Control	Outcome	Follow-up Duration	CER	EER	NNT (95% CI)
Excessive uterine bleeding¹	Levonorgestrel intrauterine system vs. control group	Number of women canceling their decision to have a hysterectomy	6 months	14	64	2 (1 to 4)
First-stage labor pain²	Intracutaneous injections of sterile water vs. placebo	Labor pain was measured with a 10-cm visual analog scale (0 cm = no pain; 10 cm = worst conceivable pain)	90 minutes	25	59	3 (2 to 13)
First-stage labor pain²	Subcutaneous injections of sterile water vs. placebo			25	52	4 (3 to 82)
Breech presentation³	Planned cesarean section vs. planned vaginal birth (control)	Perinatal or neonatal mortality or serious neonatal morbidity	6 weeks	5.0	1.6	30 (20 to 54)
		Perinatal or neonatal mortality		1.3	0.3	104 (54 to 416)
		Serious neonatal morbidity		3.8	1.4	41 (26 to 90)

References

BMJ 1998 Jul 25;317(7153):235-40
Br J Obstet Gynaecol. Jul 1999; 106: 633-7
Lancet. Oct 21, 2000; 356: 1375-83

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Example NNTs - Obstetrics-Gynecology

References