Table 1

Measurements among participants in the RCT
Measurements Method or sample used Screening -recruitment period RCT
Baseline (T0) 6 Months 1 year (T1) 2 years (T2)
I. Laboratory assessments
1.Fasting plasma glucose, HbA1c, insulin Fasting venous blood sample x x x d x d
2.2-h Postload glucose 2-h postload glucose b x x x
3.Triglycerides, HDL, LDL, cholesterol, creatinine, hs-CRP Fasting venous blood sample x x x
4.Albumin and creatinine (urine) Fasting urine sample x x x x x x
5.Blood sample storage (serum, EDTA) Fasting venous blood sample b c x
6.Weight, height, blood pressure (Omron M5-1) SOP: twice, blood pressure measured 5 times x x x x x x
7. Waist and hip circumferences, fat percentage (Omron 500) SOP: twice b x x x
III. Behavior
8.PA (SQUASH [22] adapted to SA [23]) Questionnaire (interview) x x x x x
9.Diet (based on guideline for healthful diet) Questionnaire (interview) x x x x x x
10.Smoking [24] Questionnaire (interview) x x x x x x
11.Alcohol [25] Questionnaire (interview) x x x x x x
IV. Other measurementsa
12.Ethnicity, household information Questionnaire x
13.Education, income, insurance, religion [26] Questionnaire (interview) education x x x x x
14.Physical health (cardiovascular risk profile; [27]) Questionnaire (interview) f g g g g g
15.Cardio respiratory test (Chester STEP test; [28,29]) SOP x x x
16.Perceived quality of life (SF-15; [30,31]) Questionnaire (interview) x x x x x
17.Distress (part of 4DSQ; [32]) Questionnaire (interview) x x x x x
18.Risk perception ( [33] and our own questionnaire) Questionnaire (interview) x x x x x x
19.Attitude, knowledge, social support, self-efficacy, and stages of change in PA and diet Questionnaire (interview) x x x x x
20.Perception of one’s own body Questionnaire (interview) x x x x x
V. Process
21.Dose received (participation in intervention components, frequency, leaflet, satisfaction) Questionnaire (interview) x
VI. Costs
1.Use of health care Questionnaire (interview) x x x x x
2.Costs of screening and lifestyle intervention Questionnaire (interview) h x x x x x

Legend: aQuestionnaire developed for the study; b – participants until April 19th, 2010 (n = 968); c – participants since April 19th, 2010; d – only HbA1c measurement; f – heart disease, hypertension, high cholesterol, artritis and diabetes; g – heart failure and stroke; h – only costs screening; SC, screening; HV, home visit; SOP, standard operating procedures; PA,physical activity; HDL, high-density lipoprotein; hs-CRP, highly sensitive C-reactive protein; LDL, low-density lipoprotein; PA, physical activity; SA, South Asian(s); SQUASH, Short Questionnaire to Assess Health-Enhancing Physical Activity; 4DSQ, Four-Dimensional Symptom questionnaire.

Vlaar et al.

Vlaar et al. BMC Public Health 2012 12:371   doi:10.1186/1471-2458-12-371

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