Table 3.

Subgroup analyses of the intellectual activity and social activity scores and the risk of frailty.

Scores	Slip and fall experience	Relative risk (95%CI)	P interactiona
Intellectual activity scores
1–2 vs. 0	Yes	0.72 (0.43–1.18)	0.3511
	No	0.56 (0.38–0.81)
≥3 vs. 0	Yes	1.06 (0.65–1.75)	0.0103
	No	0.51 (0.33–0.77)
Social activity scores
1–2 vs. 0	Yes	0.81 (0.54–1.22)	0.2918
	No	0.64 (0.48–0.86)
≥3 vs. 0	Yes	1.04 (0.75–1.45)	0.1983
	No	0.88 (0.70–1.10)

^aEstimated effects were adjusted on the fully adjusted model 3 (see footnote in Table 2).