condition mean min max ZT0-3 5.47836 5.47543 5.4812899999999996 ZT4-7 4.301025 4.301025 4.301025 ZT8-11 3.19423 3.19423 3.19423 ZT12-15 0 0 0 ZT16-19 4.410164999999999 4.410164999999999 4.410164999999999 ZT20-23 3.941135 3.941135 3.941135