Table 4.

Adjusted Incidence Rate Ratio of Falls Stratified by Number of Regular Medications and FRID

Medication exposure	n	Number of fall-months	Person-months adjusted for activity	Fall-months incidence rate per 100 person-months of activity-adjusted follow-up	Adjusted incidence rate ratio for fall-monthsa
Number of regular medications 0–4 (n = 206)
0–1 FRID	156	90	1,090.87	8.25 (6.63–10.14)	Ref
2+ FRIDs	50	40	331.15	12.08 (8.63–16.45)	1.43 (0.84–2.43)
Number of regular medications 5+ (n = 137)
0–1 FRID	23	16	141.93	11.27 (6.44–18.31)	Ref
2+ FRIDs	114	90	751.71	11.97 (9.63–14.72)	0.96 (0.44–2.11)

Notes: FRIDs = Fall Risk-Increasing Drugs.

^aAdjusted for age, gender, falls in the preceding year, baseline memory score, and baseline mobility score.