Development and testing of a novel survey to assess Stakeholder-driven Community Diffusion of childhood obesity prevention efforts

Table 2 Phase 2 reliability results (n = 11 paired responses; Shape Up Somerville Community Advisory Council members)

Constructs and domains	# items	One-week test-retest reliability^a		Internal scale consistency (Cronbach’s α)^b
Constructs and domains	# items	ICC (95% CI)	WSCV (95% CI)	Test	Retest	Average
Knowledge				–	–	–
Composite	20	0.88 (0.67–0.97)	0.06 (0.04–0.10)
Domain-specific
1. Problem	4	0.08 (0.00–1.00)	0.14 (0.09–0.23)	–	–	–
2. Intervention factors	4	0.83 (0.55–0.95)	0.19 (0.11–0.33)	–	–	–
3. Roles	4	0.76 (0.44–0.93)	0.15 (0.09–0.25)	–	–	–
4. Sustainability	4	0.70 (0.34–0.91)	0.13 (0.08–0.21)	–	–	–
5. Resources	4	0.59 (0.21–0.88)	0.23 (0.13–0.40)	–	–	–
Engagement
Composite	50	0.97 (0.89–0.99)	0.04 (0.03–0.07)	0.98	0.99	0.99
Domain-specific
1. Dialogue & mutual learning	11	0.96 (0.86–0.99)	0.05 (0.03–0.08)	0.95	0.97	0.96
2. Flexibility	8	0.86 (0.61–0.96)	0.10 (0.06–0.16)	0.92	0.95	0.94
3. Influence & power	4	0.88 (0.67–0.97)	0.15 (0.09–0.26)	0.91	0.95	0.93
4. Leadership & stewardship	22	0.97 (0.90–0.99)	0.04 (0.03–0.07)	0.97	0.98	0.98
5. Trust	5	0.93 (0.78–0.98)	0.07 (0.04–0.11)	0.94	0.97	0.96

ICC intraclass correlation coefficient, WSCV within-subject coefficient of variation, CI confidence interval
^aReliability results from T1, i.e., the start of Community Advisory Council members’ involvement in the Shape Up Somerville intervention
^bInternal scale consistency was not calculated for the retrospective knowledge survey component. Items were fact-based (multiple choice or true/false), and therefore not expected to relate to each other

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