The adjusted analysis of process measures identified that if schools improved their gardening score by 3 levels ( a measure of school gardening involvement - the scale has 6 levels from 0 ` no garden ' to 5 ` community involvement ' ) , irrespective of group allocation , children had , on average , a daily increase of 81g of fruit and vegetable intake ( 95 % CI : 0 , 163 ; p = 0.05 ) compared to schools that had no change in gardening score .