condition mean min max ZT0-3 4.9277225 4.3477 5.507745 ZT4-7 4.412205 4.412205 4.412205 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 1.084975 1.084975 1.084975 ZT20-23 3.2694550000000002 3.2694550000000002 3.2694550000000002