Table 2 Summary of outcome measures and measurement procedures

Sociodemographic characteristics and health status

Parent questionnaire

Physical activity

Accelerometer (Actigraph wGT3X-BT; 7 consecutive days, 24 h/day):

 • Physical activity (light, moderate, vigorous, and moderate-to-vigorous PA)

 • Sedentary time

 • Sleep (total sleep time, sleep onset latency, sleep efficiency, and wake after sleep onset)

Active commuting to/from school

Child questionnaire

Physical fitness

The ALPHA Fitness Battery:

 • Handgrip strength

 • Standing long jump test

 • 10-m shuttle run tests

 • 20-m shuttle run test

Anthropometry

Height, weight, and waist circumference

Sleep health

Accelerometer (Actigraph wGT3X-BT; 7 consecutive days, 24 h/day): total sleep time, sleep onset latency, sleep efficiency, and wake after sleep onset.

Children sleep log filled out in collaboration with their parents

Sleep Knowledge and Hygiene children questionnaire

Pediatric Sleep Questionnaire

Pediatric Daytime Sleepiness Scale

Academic achievement

Grades from the official school records for Natural Sciences, Social Sciences, Spanish language, Foreign language (English), Music, Arts, and PE

Average grade point from the official school records

Health-related quality of life

KINDL-R questionnaire for children

KINDL-R questionnaire for parents