Figure 6From: Effectiveness of dietary interventions among adults of retirement age: a systematic review and meta-analysis of randomized controlled trials Meta-regression analysis of effects of number of contacts during interventions on fruit and vegetable intakes. Slope = 3.80, Q = 36.93, d.f. = 1, P <0.0001. The circle size reflects the weight that a study obtained in the meta-regression.Back to article page