Table 3. Differences of physical performance tests according to SRH, stratified by age group (middle-aged and older women) (N = 571).

	Handgrip strength (kgf)	One-legged balance-eyes open (s)*	One-legged balance-eyes closed (s)*	Chair stands (s)*
	Median [Q25–Q75]
SRH	Middle-aged group, 40–59 years-old (N = 427)
Good	28.33 [24.00–30.67]	29.93 [20.21–30.00]	6.97 [4.10–12.14]	9.47 [8.42–10.42]
Poor	26.00 [22.33–29.33]	25.90 [16.03–30.00]	5.26 [3.16–9.26]	10.05 [9.25–11.90]
p Valuea	<0.001	0.008	0.002	0.003
Median difference (95% CI)	2.33 [1.00–3.33]	4.03 [−0.09 to 5.83]	1.71 [0.26–3.60]	4.03 [−0.01 to 5.75]
SRH	Older adults’ group, 60–80 years-old (N = 144)
Good	23.67 [20.67–27.67]	11.63 [7.36–25.56]	4.03 [2.49–5.05]	10.31 [9.25–11.90]
Poor	23.33 [20.33–26.83]	12.26 [4.53–24.84]	3.11 [1.87–5.35]	11.78 [10.15–13.77]
p Valuea	0.485	0.463	0.204	0.012
Median difference (95% CI)	0.33 [−1.67 to 3.00]	−0.63 [−5.86 to 8.86]	0.92 [−0.46 to 1.70]	−1.47 [−2.68 to −0.18]

Notes:

^*2 missing values.

^ap value for Mann–Whitney test.

SRH, Self-rated health; Q25–Q75, 25th and 75th percentiles.