The impact of non-residential grandchild care on physical activity and sedentary behavior in people aged 50 years and over: study protocol of the Healthy Grandparenting Project

Table 1 Overview of data collection measurements per test occasion (i.e., T0 to T2)

Outcome measure	Type of measurement	Instrument	Data collection approach
Socio-demographic characteristics^a	Self-report	Questionnaire, Part 1	A
Intensity of grandchild care^b	Self-report	Questionnaire, Part 2	A
Physical activity^c	Self-report	Interview, Part 1: IPAQ in Dutch	C
	Accelerometer	Actigraph wGT3X-BT	B
	Activity diary	SEMA³: Ecological Momentary Assessment or 7-day log sheet	A
Sedentary behavior^c	Self-report	Interview, Part 2: Sedentary behavior questionnaire for (older) adults in Dutch	C
	Accelerometer	Actigraph wGT3X-BT	B
	Sedentary diary	SEMA3: Ecological Momentary Assessment or 7-day log sheet	A
Health-related quality of life	Self-report	Questionnaire, Part 3: SF-36v2 in Dutch	A
Anthropometrics and body composition	Height	SECA 213 mobile stadiometer	D
	Weight	TANITA MC-780MA S	D
	Waist and hip circumference	Cescorf measuring tape	D
	Bio-electrical Impedance Analysis	TANITA MC-780MA S	D

A = User information provided during the home visit + Postal or online return of the questionnaire and/or log sheet
B = User information provided during the home visit + Postal return of the device
C = Information obtained by telephone interview at the end of the week
D = On-site measurement during the home visit at the start of the week
^aAll questions with regard to the demographics of grandchildren will be omitted in the non-grandparent version
^bThis part of the questionnaire will only be included for participants with one or more grandchildren aged between 0 and 5 years at the moment of testing
^cAll physical activity and sedentary behavior outcome measures will cover the same one-week period, consisting of 5 weekdays and 2 weekend days. The objective measurements require a prospective approach, whereas the self-report measurements are retrospectively questioning the same past week per test occasion

ISSN: 1471-2458