Determining who responds better to a computer- vs. human-delivered physical activity intervention: results from the community health advice by telephone (CHAT) trial

Hekler, Eric B; Buman, Matthew P; Otten, Jennifer; Castro, Cynthia M; Grieco, Lauren; Marcus, Bess; Friedman, Robert H; Napolitano, Melissa A; King, Abby C

doi:10.1186/1479-5868-10-109

International Journal of Behavioral Nutrition and Physical Activity

Table 1 Demographics, baseline moderators, and 12 m physical activity

From: Determining who responds better to a computer- vs. human-delivered physical activity intervention: results from the community health advice by telephone (CHAT) trial

N	Automated		Human			All
	75		73			148
Demographics					p
White/Caucasian, n (%)	67 (90.5%)		59 (80.8%)		0.09	126 (85.7%)
Women, n (%)	49 (65.3%)		50 (68.5%)		0.68	99 (66.9%)
Married/Co-habituating, n (%)	52 (70.3%)		49 (67.1%)		0.63	101 (68.7%)
drop-out, n (%)	6 (8.0%)		5 (6.9%)		0.79	11 (7.4%)
	M ± SD	Min-Max	M ± SD	Min-Max	p	M ± SD	Min-Max
Years In School	16.4 ± 1.8	12.0-18.0	16.2 ± 1.9	12.0-18.0	0.63	16.3 ± 1.8	12.0-18.0
Age	61.1 ± 5.6	55.0-77.0	60.4 ± 6.3	52.0-78.0	0.49	60.7 ± 5.9	52.0-78.0
BMI	29.2 ± 5.1	17.9-39.3	29.9 ± 5.2	19.1-42.3	0.40	29.5 ± 5.2	17.9-42.3
Baseline Mod + (kcal/kg/day)	0.7 ± 1.1	0.0-6.3	0.8 ± 1.0	0.0-4.1	0.67	0.8 ± 1.0	0.0-6.3
Baseline Moderators
Amotivation for exercise (1-7)	2.0 ± 1.0	1.0-7.0	2.1 ± 1.1	1.0-6.0	0.67	2.0 ± 1.0	1.0-7.0
Autonomy for exercise (1-7)	6.1 ± 0.9	3.7-7.0	6.2 ± 0.9	3.2-7.0	0.79	6.2 ± 0.9	3.2-7.0
Introjected motivation for exercise (1-7)	3.5 ± 1.7	1.0-7.0	3.6 ± 1.5	1.0-7.0	0.79	3.6 ± 1.6	1.0-7.0
External motivation for exercise (1-7)	2.3 ± 1.2	1.0-6.3	2.5 ± 1.1	1.0-5.5	0.21	2.4 ± 1.2	1.0-6.3
Family social support for exercise (0-75)	34.7 ± 13.3	0.0-75.0	32.6 ± 15.4	0.0-73.0	0.39	33.7 ± 14.4	0.0-75.0
Friend Social Support for Exercise (0-75)	29.0 ± 10.1	0.0-57.7	29.0 ± 9.0	0.0-57.0	1.00	29.0 ± 9.5	0.0-57.7
Social anxiety (0-18)	6.1 ± 4.1	0.0-17.0	7.4 ± 4.3	0.0-17.0	0.07	6.7 ± 4.2	0.0-17.0
Private self-consciousness (0-26)	12.9 ± 4.7	0.0-23.0	14.5 ± 5.5	0.0-26.0	0.07	13.7 ± 5.2	0.0-26.0
Public self-consciousness (0-20)	10.3 ± 4.6	0.0-20.0	11.5 ± 5.5	0.0-20.0	0.10	10.9 ± 4.7	0.0-20.0
12 m PAR Mod + (kcal/kg/day)	1.5 ± 1.5	0.0-7.6	1.6 ± 1.2	0.0-5.6	0.93	1.6 ± 1.4	0.0-7.6
18 m PAR Mod + (kcal/kg/day)	1.4 ± 1.6	0.0-9.6	1.5 ± 1.4	0.0-5.6	0.14	1.5 ± 1.5	0.0-9.6

p values represent t-test or Chi-square analyses comparing automated vs. human study arms; Mod + moderate- to vigorous-intensity physical activity.

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ISSN: 1479-5868

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