Table 2.

Effect Sizes and Necessary Sample Sizes for Normally Menstruating Women and Oral-Contraceptive Women to Reach Significance at the .01 Level for Menstrual Cycle Phase Contrasts Are Presented for Mean Response Criterion, B, and Mean Discriminitability, P(A). Target Power for the Sample Size Calculation Was 80%

Phase Contrasts	Normally Menstruating Women				Oral Contraceptive Women
	Response Criterion, B		Discriminability P(A)		Response Criterion, B		Discriminability P(A)
	Effect Size	Sample Size Needed	Effect Size	Sample Size Needed	Effect Size	Sample Size Needed	Effect Size	Sample Size Needed
Menstrual vs follicular	.399	75	.063	2,935	.319	116	n/a	n/a
Menstrual vs ovulatory	.024	20,185	.099	1,204	.389	78	n/a	n/a
Menstrual vs luteal	.154	495	.380	82	.209	270	.114	897
Menstrual vs late luteal	.292	138	n/a	n/a	.432	64	.088	1,521
Follicular vs ovulatory	.325	112	.025	19,032	.207	274	n/a	n/a
Follicular vs luteal	.122	787	.150	519	.175	384	.219	246
Follicular vs late luteal	.035	9,707	.073	2,198	.159	464	.085	1,612
Ovulatory vs luteal	.185	342	.184	348	.340	102	.142	585
Ovulatory vs late luteal	.322	114	.141	590	.271	160	.067	2,613
Luteal vs late luteal	.207	273	.366	88	n/a	n/a	.053	4,220