Fig. 2From: Can a multi-level intervention approach, combining behavioural disciplines, novel technology and incentives increase physical activity at population-level?Increase in daily steps between pre-Challenge and Challenge periods across waves. NSC=National Step Challenge. Pre-Challenge=period between registration and the start of the Challenge. Challenge period=period during which step count-based rewards can be obtained (guaranteed or sure-win and lucky-draw). Δ=difference between pre-Challenge and Challenge mean daily stepsBack to article page