condition mean min max ZT0-3 84.794025 82.21385000000001 87.3742 ZT4-7 58.43325 58.43325 58.43325 ZT8-11 158.2785 158.2785 158.2785 ZT12-15 0 0 0 ZT16-19 182.976 182.976 182.976 ZT20-23 116.3315 116.3315 116.3315