Table 4. Cronbach's α in all four samples using original and revised CPQ scoring systems.

	Males					Females
Sample	Old α	New α	Diff.	X2	Prop. Incr.	Old α	New α	Diff.	X2	Prop. Incr.
Clinical Trial
CC	.566	.801 a	.235	22.9***	.415	.650	.808 a	.158	18.6***	.243
SD / PW	.618	.782 a	.164	26.6***	.265	.645	.770 a	.125	17.3***	.194
PD / SW	.541	.736 a	.195	17.4***	.360	.615	.751 a	.136	14.0***	.221
Community
CC	.790	.845	.055	14.0***	.070	.781	.863	.082	29.3***	.105
SD / PW	.679	.805 a	.126	65.0***	.186	.657	.813 a	.156	128.7***	.237
PD / SW	.722	.820	.098	58.1***	.136	.699	.821 a	.122	88.6***	.175
Clinic
CC	.757	.803	.046	1.0	.061	.720	.812	.092	3.5+	.128
SD / PW	.647	.765 a	.118	9.2**	.182	.689	.795 a	.106	9.6**	.154
PD / SW	.654	.804 a	.150	12.8***	.229	.532	.726 a	.194	11.4***	.365
Divorcing
CC	.562	.666	.104	1.2	.185	.569	.720 a	.151	3.2+	.265
SD / PW	.634	.617	-.017	0.1	-.027	.642	.802 a	.160	16.0***	.249
PD / SW	.622	.794 a	.172	12.5***	.277	.758	.814	.056	2.7	.074

Note. CC = Constructive communication. SD / PW = Self-demand/partner-withdraw. PD / SW = Partner-demand/self-withdraw. Old α = intra-class correlation (ICC; Cronbach's α) of original scoring. New α = ICC of revised scoring. Diff = difference (subtracted) between α of revised scoring and original scoring. X² = chi-square test of difference of old and new Cronbach alphas. Prop. Incr. = proportion increase in α when moving from original to revised scoring. Bolded numbers represent cases in which ICC is at or above .7;

^a= went from below .7 (original scoring) to above .7 (revised scoring).

⁺p < .10,

^*p < .05,

^**p < .01,

^***p < .001