Table 1.

Characteristics of the nursing home residents

Variable	Nursing home
	A	B	C
Capacity	150	100	50
No of residents studied	144	48	33
Age, years (median [range])	85.0 (53–100)	86.5 (52–100)	84.0 (60–98)
Female sex, %	71.5	83.3	75.8
Length of stay, days (median ± SD [range])	300 ± 345 (2–1,490)	105 ± 194 (2–1,015)	87 ± 136 (8–630)

Abbreviation: SD, standard deviation.