Table 2. Median levels of physical performance according to covariates (N = 571).

	Handgrip strength (kgf)	One-legged balance-eyes open (s)*	One-legged balance-eyes closed (s)*	Chair stands (s)*
SRH	Median [Q25–Q75]
Good	27.50 [23.33–30.00]	26.90 [16.95–30.00]	5.73 [3.77–10.66]	9.60 [8.52–10.74]
Poor	25.33 [21.50–28.67]	23.26 [11.34–30.00]	4.61 [2.80–8.15]	10.37 [9.00–12.25]
p Valuea	<0.001	0.002	<0.001	<0.001
Education
Basic education or more (≥8 years)	26.67 [23.33–30.00]	27.04 [17.08–30.00]	5.62 [3.37–10.21]	9.93 [8.50–11.35]
Less than basic education (<8 years)	25.00 [21.33–28.67]	19.72 [8.77–30.00]	4.37 [2.72–7.92]	10.33 [9.10–12.59]
p Valuea	<0.001	<0.001	<0.001	0.001
Family income
≥3 minimum wages	27.17 [23.33–30.00]	24.82 [12.81–30.00]	5.05 [2.95–9.29]	10.07 [8.53–11.40]
<3 minimum wages	25.50 [22.00–29.00]	24.53 [12.85–30.00]	5.01 [2.99–8.89]	10.19 [8.90–11.88]
p Valuea	0.010	0.329	0.808	0.162
BMI
Normal	25.00 [21.42–28.67]	28.13 [18.69–30.00]	6.16 [3.37–11.88]	9.81 [8.48–11.10]
Overweight	26.00 [22.67–29.33]	25.47 [12.55–30.00]	5.05 [2.95–9.38]	10.11 [8.79–11.84]
Obese	26.33 [22.00–30.00]	21.36 [10.86–30.00]	4.59 [2.82–7.41]	10.33 [9.15–11.91]
p Valueb	0.105	0.002c	0.014c	0.036c
Physical activity
Yes	27.00 [22.67–29.33]	25.65 [14.38–30.00]	5.34 [3.37–9.53]	10.09 [8.78–11.48]
No	25.33 [22.00–29.33]	23.48 [11.58–30.00]	4.70 [2.73–8.75]	10.13 [8.82–11.91]
p Valuea	0.104	0.246	0.045	0.551
Chronic conditions
0–2	26.00 [22.33–29.33]	25.53 [13.47–30.00]	5.20 [3.11–9.68]	10.06 [8.73–11.66]
3 or more	25.00 [21.33–28.00]	17.23 [7.45–24.87]	3.66 [2.43–5.82]	10.36 [9.39–12.32]
p Valuea	0.062	<0.001	<0.001	0.078
Menopausal Status
Premenopausal	27.00 [23.67–30.67]	28.14 [19.13–30.00]	6.51 [3.78–12.35]	9.66 [8.49–10.77]
Perimenopausal	27.67 [23.17–30.83]	26.89 [18.90–30.00]	5.37 [2.97–8.89]	9.87 [8.51–11.28]
Postmenopausal	25.33 [21.33–28.67]	21.36 [10.13–30.00]	4.55 [2.65–8.20]	10.34 [9.00–12.24]
p Valueb	<0.001d, e	<0.001d, e	<0.001d, f	<0.001d
Age at first child
≥18 years-old or nulliparous	26.00 [22.33–29.33]	24.89 [12.97–30.00]	5.05 [2.97–9.73]	10.13 [8.79–11.73]
<18 years-old	25.33 [21.83–29.00]	24.50 [12.72–30.00]	4.94 [2.80–8.08]	10.08 [8.77–11.90]
p Value b	0.055	0.710	0.590	0.895
Parity
0–2	26.67 [22.67–29.33]	27.04 [16.40–30.00]	5.67 [3.15–10.96]	9.94 [8.60–11.29]
3 or more	25.33 [22.00–29.33]	21.92 [10.50–30.00]	4.63 [2.84–8.01]	10.25 [8.97–12.22]
p Valuea	0.116	<0.001	0.002	0.011

Notes:

^*2 missing values.

^ap value for Mann–Whitney test.

^bp value for Kruskal–Wallis test.

^cObese ≠ normal.

^dpostmenopausal ≠ premenopausal.

^epostmenopausal ≠ perimenopausal.

^fperimenopausal ≠ premenppausal.

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

Higher values indicate better performance for grip strength, and the balance tests, and worse performance for chair stands.