. 2019 Feb 28;7(2):e12209. doi: 10.2196/12209

Table 7.

Spearman rank correlation between engagement metrics and weight change. The table displays correlations and P values for the treatment arms that were asked to track during the given time period.

Engagement metric		Weight change by 1 month	Weight change by 3 months
Percentage of action plans completed		—^a	Both: −.41^b
		—	Sim^c: −.07
		—	Seq^d: −.60^b
Baseline to 4 weeks
	Percentage of days tracked weight	Both: −.35^b	Both: −.40^b
		Sim: −.40^e	Sim: −.51^e
		Seq: −.29	Seq: −.34
	Percentage of days tracked diet	Both: −.42^b	Both: −.40^b
		Sim: −.36	Sim: −.30
		App^f: −.51^b	App: −.48^b
5 to 12 weeks
	Percentage of days tracked weight	Both: −.44^b	Both: −.48^b
		Sim: −.37	Sim: −.49^e
		Seq: −.54^b	Seq: −.46^e
	Percentage of days tracked diet	All^g: −.37^b	All: −.42^b
		Sim: −.24	Sim: −.27
		Seq: −.50^b	Seq: −.44^e
		App: −.52^b	App: −.55^b
Entire intervention
	Percentage of days tracked weight	Both: −.44^b	Both: −.47^b
		Sim: −.40^e	Sim: −.48^e
		Seq: −.50^b	Seq: −.47^e
	Percentage of days tracked diet^h	Both: −.35^b	Both: −.42^b
		Sim: −.30	Sim: −.25
		App: −.52^b	App: −.58^b
13 weeks to 6 months (post intervention period)ⁱ
	Percentage of days tracked weight	Both: −.50^b	Both: −.43^b
		Sim: −.49^b	Sim: −.43^e
		Seq: −.59^b	Seq: −.43^e
	Percentage of days tracked diet	Both: −.29^b	All: −.35^b
		Sim: −.27	Sim: −.17
		Seq: −.42^e	Seq: −.47^e
		App: −.20	App: −.39

^aNot applicable.

^bP<.01.

^cSim: Simultaneous self-monitoring arm.

^dSeq: Sequential self-monitoring arm.

^eP<.05.

^fApp: App-Only self-monitoring arm.

^gAll: All 3 treatment arms.

^hAs the Sequential arm did not track diet in the first 4 weeks of the intervention, their results for the “Entire intervention” section would be the same as the results in the “5 to 12 weeks” section above.

ⁱOne additional participant was omitted in analyses (App-Only arm) at 6 months because of becoming ineligible after the intervention period and before 6-months.