The purpose of this controlled intervention study is to evaluate the effectiveness of a school-based intervention aiming at increasing the water consumption in elementary school children. The intervention schools received refillable water bottles and drying racks for all school children as well as educational material. The focus of the intervention is the promotion of drinking tap water.
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Change in water consumption of school children (from baseline to post-intervention and follow-up)
Timeframe: baseline, end of intervention (after one school year, 9 months), follow-up (after two school years, 21 months)
Change of attitude of school children towards drinking water (from baseline to post-intervention and follow-up)
Timeframe: baseline, end of intervention (after one school year, 9 months), follow-up (after two school years, 21 months)