Table 2.

Odds Ratios for Predictors of Class Membership at Pregnancy, 3-Class Latent Transition Model^a on 29 Food and Beverage Groups, Pregnancy, Infection, and Nutrition Study, 2000–2005

Covariate	OR for “Prudent”	OR for “Health Conscious Western”	OR for “Western”	Change in 2 Log Likelihood	df	P Value
Nullipara	1	0.34	0.47	8.1	2	0.0176
Smoker	1	1.66	4.02	12.2	2	0.0022
White	1	0.63	0.23	21.6	2	0.0001
One or more years of graduate-level education	1	0.98	0.23	30.7	2	0.0000
Energy consumption during pregnancy
2nd Quartile based on kcal at pregnancy	1	4.98	1.35	9.3	2	0.0095
3rd Quartile based on kcal at pregnancy	1	22.39	1.70	68.0	2	0.0001
4th Quartile based on kcal at pregnancy	1	24.74	3.31	158.9	2	0.0001

Abbreviation: OR, odds ratio.

^a The 3-class latent transition model has 2 parts that are estimated simultaneously. The first part, known as the measurement model, assumed that the 29 food and beverage groups at each point were conditionally independent given class membership and that food and beverage groups were time invariant except for coffee and alcohol. The second part, known as the structural model, specifies 2 models: 1 model for the class membership at the first time point and a second model for the transition probabilities. The first model is a baseline-category logit model for dietary pattern class membership at pregnancy adjusting for covariates (parity, smoking status, race, education level, and 3 dummy variables for quartiles of energy intake at baseline); estimates shown in this table. The second model is also a baseline-category logit model for transition probabilities from pregnancy to 3 months and from 3 to 12 months postpartum.