Table 2.

Absolute risks and numbers needed to treat by week of gestation in the ALPS cohort, re-weighted to reflect the gestational age distribution at maternal admission for delivery of a population-based sample within the late preterm period from British Columbia, Canada, 2000–2013.

Outcome	Data	Gestational age	Antenatal corticosteroids risk per 100	Placebo risk per 100	Absolute risk per 100 (95% confidence interval)	Number Needed to Treat
Primary outcome	Original ALPS	34 weeks	19.3	23.3	−4.1 (−8.1, 0.1)	24
	Original ALPS	35 weeks	11.2	13.6	−2.4 (−4.7, 0.0)	42
	Original ALPS	36 weeks	6.6	7.9	−1.4 (−2.8, 0.0)	72
	ALPS re-weighted	34 weeks	19.7	23.4	−3.7 (−7.9, 0.5)	27
	ALPS re-weighted	35 weeks	11.1	13.2	−2.1 (−4.4, 0.3)	48
	ALPS re-weighted	36 weeks	6.3	7.5	−1.2 (−2.5, 0.1)	84
Major respiratory morbidity	Original ALPS	34 weeks	13.8	20.2	−6.4 (−10.1, −2.3)	16
	Original ALPS	35 weeks	7.6	11.1	−3.6 (−5.6, −1.5)	28
	Original ALPS	36 weeks	5.2	6.2	−2.0 (−3.2, −0.7)	51
	ALPS re-weighted	34 weeks	13.9	20.4	−6.5 (−10.1, −2.1)	15
	ALPS re-weighted	35 weeks	7.4	10.9	−3.5 (−5.5, −1.1)	29
	ALPS re-weighted	36 weeks	4.0	5.8	−1.9 (−3.2, −0.6)	54