Age trajectories of disability in instrumental activities of daily living and disability-free life expectancy among middle-aged and older adults in Taiwan: an 11-year longitudinal study

Table 1 Results of logistic regressions for age trajectories of IADL disability among study participants

	Group 1	Group 2
	Late onset	Early onset
Parameters for IADL disability trajectory
Intercept	−2.140 (.127)^*	0.399 (.138)^*
Linear scaled age^§	2.047 (.098)^*	1.873 (.284)^*
Quadratic scaled age^§		1.685 (.492)^*
Cubic scaled age^§		1.050 (.240)^*
Group size (%)	67.66 (2.867) ^*	32.34 (2.867) ^*
Average posterior probabilities	0.88	0.81
Bayesian Information Criterion = − 5132.56 (N = 3118)

Note. Standard errors are in parentheses; ^*p < .05; ^§Scaled age = (age - 71.43) / 10; Group size represents the estimated proportion of the population corresponding to each group; average posterior probabilities for each trajectory group were > 0.7, indicating that the models were acceptable [20]

ISSN: 1471-2318