. 2011 Aug 13;285(3):641–647. doi: 10.1007/s00404-011-2055-y

Table 7.

Normalization of birth weight in both groups regarding gestational age and parity

		Levene’s test for equality of variances		t test for equality of means
		F	Sig.	T	Sig. (2-tailed)	Mean difference	Std. error difference	95% confidence interval of the difference
		F	Sig.	T	Sig. (2-tailed)	Mean difference	Std. error difference	Lower	Upper
Gestational age	Equal variances assumed	330.340	0.000	12.172	0.000	24.043	1.975	20.138	27.949
Gestational age	Equal variances not assumed			10.633	0.000	24.043	2.261	19.521	28.566
Parity	Equal variances assumed	0.104	0.747	−1.113	0.268	−0.271	0.244	−0.753	0.210
Parity	Equal variances not assumed			−1.105	0.271	−0.271	0.245	−0.757	0.215