Development of new physical activity and sedentary behavior change self-efficacy questionnaires using item response modeling

Table 3 Participant Characteristics

Characteristic	Missing data status group
	Missing all SE and accelerometer data	Some or complete SE data with or without accelerometer data
Total^a n (%)	382 (40.6)	560 (59.4)
Gender n (%)
Male	193 (50.5)	276 (49.3)
Female	187 (49.0)	276 (49.3)
Missing^b	2 (0.5)	8 (1.4)
Race/Ethnicity* n (%)
White	37 (9.7)	87 (15.5)
Black	88 (23.0)	155 (27.7)
Hispanic	214 (56.0)	270 (48.2)
Other	40 (10.5)	38 (6.8)
Missing^b	3 (0.8)	10 (1.8)
Highest education for head of household n (%)
HS graduate or less	208 (54.5)	261 (46.6)
Some college or specialized training	95 (24.9)	159 (28.4)
College graduate	51 (13.4)	68 (12.1)
Missing^b	28 (7.3)	72 (12.9)
Age (in years) n: M (SD)	380: 11.3 (0.6)	552: 11.3 (0.6)
BMI%tile n: M (SD)	377: 73.2 (27.9)	552: 70.5 (28.1)

^a Total percents are displayed as row percents; remaining percents are displayed as column percents
^b Missing not included in chi-square tests of association
* Significant [X²(3) = 14.17, p = .003] association between missing data status and race/ethnicity; however, the contingency coefficient (C = 0.13) showed that the association was small. Hispanic participants were more like than White participants [OR = 1.9 (1.2, 2.8)] and more likely than Black participants [OR = 1.4 (1.0, 1.9)] to have all missing data

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