condition mean min max ZT0-3 221.10000000000002 221.10000000000002 221.10000000000002 ZT4-7 146.6 146.6 146.6 ZT8-11 146.25 146.25 146.25 ZT12-15 131.14999999999998 131.14999999999998 131.14999999999998 ZT16-19 136.0 136.0 136.0 ZT20-23 161.39999999999998 161.39999999999998 161.39999999999998