. 2019 Apr 15;21(4):e11756. doi: 10.2196/11756

Table 6.

Cluster membership and participation.

Comparison dimension		Assignment-Focused (n=16)	Short Message Histories (n=62)	Pain-Focused (n=20)	Activity-Focused (n=25)	F value (df)	P value
Age (years), mean (SD)
	Teen	13.80 (1.4)^a	15.01 (1.6)^b	14.69 (1.7)	14.27 (1.6)	3.1 (3,119)	.03^c
Gender, observed/expected							.93^d
	Male	3/3	14/13	3/4	6/5	—^e	—
	Female	13/13	48/49	17/16	19/20	—	—
Number of messages, mean (SD)
	Teen	4.38 (3.5)^a	1.65 (1.7)^b,f,g	5.4 (2.8)^a	4.24 (3.0)^a	16.2 (3,119)	<.001^c
	Parent	4.56 (3.0)^a	1.95 (1.6)^b,f	3.80 (2.7)^a	3.04 (2.0)	8.7 (3,119)	<.001^c
Message word count, mean (SD)
	Teen	32.23 (1.0)	25.00 (1.9)	32.28 (1.0)	34.90 (0.4)	2.1 (3,119)	.10
	Parent	41.7 (1.0)	42.58 (1.9)	46.39 (1.1)	46.64 (0.4)	0.3 (3,119)	.80
Module completion rate, mean (SD)
	Teen	7.63 (0.9)	7.13 (1.6)^g	7.65 (0.8)	7.92 (0.4)^a	2.8 (3,117)	.05^c
	Parent	7.44 (1.0)	7.00 (1.9)	7.6 (1.1)	7.88 (0.4)	2.5 (3,117)	.06
Interactive fields completed, mean (SD)
	Teen	82.73 (12.0)	75.18 (18.8)^g	83.07 (8.5)	85.58 (7.4)^a	3.8 (3,119)	.01^c
	Parent	68.84 (17.3)	70.27 (22.5)	72.72 (19.5)	81.81 (7.6)	2.4 (3,119)	.07

^aThe given cluster is significantly different from the Short Message Histories cluster at the .05 level.

^bThe given cluster is significantly different from the Assignment-Focused cluster at the .05 level.

^cSignificant at the .05 level.

^dFisher’s Exact Test was performed because the gender variable is categorical and had expected cell values of less than 5 (please refer back to the Methods section for more detail).

^eNot applicable.

^fThe given cluster is significantly different from the Pain-Focused cluster at the .05 level.

^gThe given cluster is significantly different from the Activity-Focused cluster at the .05 level.