condition mean min max ZT0-3 158.14999999999998 158.14999999999998 158.14999999999998 ZT4-7 170.9 170.9 170.9 ZT8-11 156.55 156.55 156.55 ZT12-15 185.5 185.5 185.5 ZT16-19 166.55 166.55 166.55 ZT20-23 208.3 208.3 208.3