Table 2

Sociodemographic characteristics and LTPA of cancer survivors aged 20 years or older from the NHANES (2007–2010), by circulating 25-OHD levels (n=737)

	Circulating 25-OHD (nmol/L)
		Overall	Quintile 1 (13.2–49.2)	Quintile 2 (49.3–63.9)	Quintile 3 (64.3–76.5)	Quintile 4 (76.6–93.4)	Quintile 5 (93.9–206)	p Value
2007–2010	N	737	194	153	139	143	108
Age (year)	Mean (SE)	60.8 (0.7)	58.9 (1.3)	59.8 (1.1)	61.7 (1.4)	64.3 (1.5)	59.3 (2.0)	0.35
Body mass index								0.008
<18.5	%	2.0	2.2	0.6	1.5	1.8	3.9
18.5–24.9	%	27.2	23.1	20.3	21.2	36.7	34.6
25.0–29.9	%	34.0	24.7	45.5	34.1	30.4	35.6
≥30	%	36.8	50.0	33.6	43.2	31.1	25.9
Season								0.1
Winter (November–April)	%	32.6	39.7	32.7	34.2	22.4	33.9
Summer (May–October)	%	67.4	60.3	67.3	65.8	77.6	66.1
Sex								0.40
Male	%	37.8	29.3	42.8	41.2	39.9	36.2
Female	%	62.2	70.7	57.2	58.8	60.1	63.8
Race								<0.001
Non-Hispanic white	%	82.6	57.3	81.9	88.8	91.5	94.1
Non-Hispanic black	%	8.2	20.9	7.5	5.3	4.9	2.2
Hispanic and other	%	9.2	21.8	10.6	5.9	3.6	3.7
Smoking								0.03
Never smoked	%	47.5	48.5	55.1	48.9	43.1	43.8
Former smoker	%	35.1	26.2	25.8	43.3	43.0	37.2
Current smoker	%	17.4	25.3	19.1	9.8	13.9	19.0
Vitamin D supplement use								<0.001
No	%	48.5	81.8	61.1	46.1	32.8	20.0
Yes	%	51.5	18.2	38.9	53.9	67.2	80.0
LTPA								0.04
Inactive	%	53.3	70.8	51.7	51.3	50.9	41.6
Insufficiently active	%	16.6	12.6	20.8	15.7	14.3	19.8
Sufficiently active	%	30.1	16.6	27.5	33.0	34.8	38.6

25-OHD, 25-hydroxyvitamin D; LTPA, leisure-time physical activity; NHANES, National Health and Nutrition Examination Survey.