. 2019 Apr 9;7(4):e11720. doi: 10.2196/11720

Table 1.

Descriptive statistics for study variables in the electronic message group versus the control group pre- and postmatch. Means reported for age, weight change, class attendance; proportions reported for sex and race. SD=standardized difference (unitless measure of similarity, where closer to 0 is more similar). Variables with blank SD were not included in the match.

Variable		Prematch				Postmatch
		Control (n=376)	Intervention (n=88)	SD	P value	Control (n=88)	Intervention (n=88)	SD	P value
Age (years)		41.2	39.5	−0.27	.03	39.6	39.5	−0.01	.70
Female (prop^a)		0.57	0.66	0.18	.13	0.66	0.66	0	>.99
Hispanic (prop)		0.2	0.3	0.25	.03	0.3	0.3	0	>.99
Black (prop)		0.03	0.02	−0.07	.57	0.02	0.02	0	>.99
Asian/Pacific Islander (prop)		0.12	0.08	−0.13	.28	0.08	0.08	0	>.99
Other (prop)		0.05	0.08	0.14	.24	0.08	0.08	0	>.99
Weight (kg) change 6 months		−7.5	−6.2	0.21	.07	−6.0	−6.2	−0.03	.50
Class attendance 6 months (%)		81.8	79.4	−0.17	.16	80.4	79.4	−0.07	.15
Propensity score		0.84	0.86	0.33	.01	0.87	0.86	−0.02	.26
Adherence at 6 months
	Low carb (g)	112.8^b	115.9^c	—^d	—	114.9^e	115.9^c	—	—
	Low fat (g)	217.2^f	206.7^g	—	—	217.1^h	206.7^g	—	—

^aprop: proportions.

^bn=195.

^cn=43.

^dNot applicable.

^en=39.

^fn=181.

^gn=45.

^hn=49.