Table 1

Time points of outcome measures and data collection

Time point (months)	Name of visit	Informed consent	OGTT & blood sample for storage	Anthropometric measurements	Demographic, socioeconomic self-reported medical history	Costs and health resource use	Physical activity data	Delivery of intervention (intensive or light)
–1*	Screen	✓	✓		✓
0*†	Baseline	✓†		✓†	✓	✓	✓	General information on diabetes, diet and physical activity to all participants
0*† (plus 1 week)	Family (as the cluster) randomised to 15 or four-visit group
1	Interim			✓		✓		✓
2	Interim			✓		✓		✓
3	Interim			✓		✓		✓
6	Interim			✓		✓		✓
9	Interim			✓		✓		✓
12*†	Annual			✓†	✓	✓	✓	Intensive or light
15	Interim			✓		✓		✓
18	Interim			✓		✓		✓
21	Interim			✓		✓		✓
24*†	Annual			✓ †	✓	✓	✓	Intensive or light
				✓		✓		✓
27	Interim			✓		✓		✓
30	Interim			✓		✓		✓
33	Interim			✓		✓		✓
36*†	Annual		✓ (OGTT repeated if positive for diabetes)	✓†	✓	✓	✓	Intensive or light

*Measurements and data collected similarly for participants in intervention and control groups—or prior to randomisation.
†Indicates time points and data collection for Family Volunteers.
OGTT, Oral Glucose Tolerance Test.