Table 2.

Latent Class Analysis Fit Statistics for Walking, Comparing Models With the Parameters Constrained to Be the Same Between the Sexes With Those Without Such a Constraint, National Survey of Health and Development (n = 3,587), United Kingdom, 1982–1989

	No. of Latent Classes
	1	2	3
Parameters Allowed to Differ Between Males and Females
No. of parameters	17	35	53
Log likelihood	−14,610.7	−14,510.0	−14,480.0
Smallest class percentagea
Males	100.0	47.2	16.8
Females	100.0	33.5	7.8
Parameters Constrained to Be the Same for Males and Females
No. of parameters	9	19	29
Log likelihood	−14,739.1	−14,610.7	−14,527.0
Smallest class percentagea
Males	100.0	0.0	0.0
Females	100.0	0.0	1.1
Overall	100.0	49.7	20.9
Difference in no. of parameters	8	16	24
Likelihood ratio test
Statistic	256.8	201.4	94.0
P value	<0.001	<0.001	<0.001

^aBased on estimated posterior class membership probabilities.