Classification of occupational activity categories using accelerometry: NHANES 2003–2004

Table 2 Demographic characteristics by OA groupings in the National Health and Examination Survey 2003–2004 (n = 1112)

Characteristic	High OA (N = 289)	Intermediate OA (N = 300)	Low OA (N = 523)	p-value*
Age (years), M (SE)	39.3 (0.88)	39.6 (0.74)	42.0 (0.50)	0.009^a,c
BMI, M (SE)	27.5 (0.57)	28.9 (0.48)	28.2 (0.31)	0.15
Race/ethnicity, %
Non-Hispanic white	63.6	69.4	77.9	<0.0001^a,c
Non-Hispanic black	8.3	9.7	8.9
Mexican American	16.9	11.4	4.1
Other	11.1	9.6	9.2
Sex
Men	86.8	62.1	42.3	<0.001^a,b,c
Women	13.2	37.9	57.7
Marital Status
Married/living with partner	74.5	69.6	69.4	0.2
Single/not living with partner	25.5	30.4	30.6
Education, %
<High school	23.5	13.1	2.8	<0.001^a,b,c
High school	33.3	38.9	16.6
>High school	43.2	48.0	80.6
Household Income, %
<25K	16.5	16.1	5.1	<0.001^a,c
25–<45K	23.5	31.6	13.1
45–<75K	33.9	25.7	28.6
75K+	22	21.5	49.5
Missing	4.1	5.1	3.7
Smoking, %				<0.001^a,b,c
Never	42.9	58.1	58.4
Former	25.2	12.9	24.4
Current	31.9	29.0	17.2
Wear time (min/day), M (SE)	889.5 (7.93)	884.8 (6.99)	884.7 (4.16)	0.89

High OA high occupational activity, Intermediate OA intermediate occupational activity, Low OA low occupational activity, M mean, SE standard error. *p values for overall group comparisons. Pairwise comparisons: ^aHigh OA significantly different from Low OA, ^bHigh OA significantly different from Intermediate OA, ^cIntermediate OA significantly different from Low OA (p < 0.05)

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