condition mean min max ZT0-3 3.8798025000000003 1.966 5.793605 ZT4-7 4.35112 4.35112 4.35112 ZT8-11 3.5854999999999997 3.5854999999999997 3.5854999999999997 ZT12-15 0 0 0 ZT16-19 6.93441 6.93441 6.93441 ZT20-23 7.646205 7.646205 7.646205