From: Risk factors of functional disability among community-dwelling elderly people by household in Japan: a prospective cohort study
Household
Number
Onset of functional disability
HR
95% CI
pvalue
Three-generation
798
163
Children-only
101
29
1.61
1.08-2.40
0.020
Spouse-only
131
19
0.91
0.56-1.48
0.693
Living alone
54
15
1.13
0.86-1.48
0.377