Table 3:

Approximated risk ratios for outcomes with childbirth education by number of sessions in the course

	Any Childbirth Education ARR (95% CI)	Analysis by Structure of Childbirth Education
		Single Session ARR (95% CI)	2 Session Course ARR (95% CI)	≥3 Sessions ARR (95% CI)
Induction of Labor	0.97 (0.84 – 1.11)	1.10 (0.91 – 1.32)	0.99 (0.80 – 1.21)	0.93 (0.79 – 1.08)
Any Pain Medication	0.94 (0.88– 0.98)	0.93 (0.84 –0.99)	0.94 (0.87 – 1.00)	0.95 (0.91 – 0.99)
Use of Epidural	0.94 (0.90–0.99)	0.90 (0.80 – 0.98)	0.98 (0.91 – 1.04)	0.95 (0.90 – 1.00)
Use of Opioids	1.22 (1.06 – 1.39)	1.28 (1.06 – 1.51)	0.75 (0.55 – 1.02)	1.28 (1.12 – 1.46)
Any Cesarean	0.92 (0.79 – 1.06)	0.88 (0.69 – 1.10)	0.87 (0.69 – 1.11)	0.97 (0.90 – 1.03)
Planned Cesarean	0.65 (0.46 – 0.92)	0.62 (0.34 – 1.10)	0.66 (0.37 – 1.17)	0.74 (0.53 – 0.99)
Unplanned Cesarean	1.02 (0.87 – 1.19)	0.98 (0.76 – 1.24)	0.98 (0.75 – 1.25)	1.04 (0.85 – 1.28)
Decision Making	1.07 (1.01 – 1.12)	1.07 (0.98 – 1.16)	1.04 (0.94 – 1.13)	1.20 (1.04 – 1.37)