condition mean min max ZT0-3 64.163625 58.65685 69.6704 ZT4-7 73.05664999999999 73.05664999999999 73.05664999999999 ZT8-11 71.5012 71.5012 71.5012 ZT12-15 0 0 0 ZT16-19 94.31395 94.31395 94.31395 ZT20-23 72.6489 72.6489 72.6489