Table 1.

Practice characteristics

		Rate of intrapartum referrals among nulliparous women in midwifery practices (tertiles)
		T1 (low)	T2	T3 (high)	Total	χ 2 p-value
		n = 140	n = 141	n = 140	n = 421
Practice size	≤ 139	57	38	46	141	.19
(nr of births attended/yr)	140-229	42	50	47	139
	≥ 230	41	53	47	141
Distribution of parity	Nulliparous women	46.0%	46.4%	46.8%	46.4%
	Multiparous women	54.0%	53.6%	53.2%	53.6%