Table 1

Sociodemographic characteristics and LTPA of cancer survivors aged 20 years or older from the NHANES (2001–2006), by circulating 25-OHD levels (n=793)

	Circulating 25-OHD (nmol/L)
		Overall	Quintile 1 (9.1–44.7)	Quintile 2 (45.9–56.8)	Quintile 3 (58.1–66.8)	Quintile 4 (68–80.3)	Quintile 5 (81–156)	p Value
2001–2006	N	793	208	160	143	153	129
Age (year)	Mean (SE)	60.3 (0.6)	60.1 (1.5)	59.4 (1.8)	61.0 (1.6)	61.9 (1.4)	57.6 (1.6)	0.36
Body mass index								<0.001
<18.5	%	1.9	1.9	0.2	1.8	2.6	3.4
18.5–24.9	%	32.7	29.3	19.4	33.8	35.5	47.1
25.0–29.9	%	32.1	23.2	36.1	38.4	31.2	32.1
≥30	%	33.3	45.6	44.3	26.0	30.7	17.4
Season								0.12
Winter (November–April)	%	34.3	43.2	38.8	31.0	26.1	31.5
Summer (May–October)	%	65.7	56.8	61.2	69.0	73.9	68.5
Sex								0.52
Male	%	32.7	29.2	32.5	33.3	39.4	38.6
Female	%	67.3	70.8	67.5	66.7	60.6	70.4
Race								<0.001
Non-Hispanic white	%	86.1	72.1	81.9	90.9	93.8	93.6
Non-Hispanic black	%	6.6	18.7	6.3	2.3	1.7	2.8
Hispanic and other	%	7.3	9.2	11.8	6.8	4.5	3.6
Smoking								0.06
Never smoked	%	39.1	32.5	42.7	48.7	36.1	36.3
Former smoker	%	39.8	37.5	34.5	40.5	46.4	40.4
Current smoker	%	21.1	30.0	22.8	10.8	17.5	23.3
Vitamin D supplement use								<0.001
No	%	48.6	75.8	52.7	34.8	42.5	34.3
Yes	%	51.4	24.2	47.3	65.3	57.5	65.7
LTPA								0.001
Inactive	%	38.2	55.5	40.7	36.6	30.8	26.1
Insufficiently active	%	33.0	27.4	35.4	29.1	39.8	33.0
Sufficiently active	%	28.8	17.1	23.9	34.3	29.4	40.9
Indoor LTPA								0.08
Inactive	%	61.7	70.3	67.4	53.8	61.2	54.2
Insufficiently active	%	18.2	15.3	20.1	21.5	17.4	16.7
Sufficiently active	%	20.1	14.4	12.5	24.7	21.4	29.1
Outdoor LTPA								<0.001
Inactive	%	52.0	72.3	51.2	54.7	39.4	41.5
Insufficiently active	%	22.0	12.9	24.1	15.8	29.9	27.5
Sufficiently active	%	26.0	14.8	24.7	29.5	30.7	31.0

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