condition mean min max ZT0-3 1.3315666666666666 1.22942 1.47681 ZT4-7 0.761124 0.761124 0.761124 ZT8-11 0.477782 0.477782 0.477782 ZT12-15 0.8605637500000001 0.7506595 0.970468 ZT16-19 0.407782 0.407782 0.407782 ZT20-23 0.4214915 0.4214915 0.4214915