condition mean min max ZT0-3 94.629719 94.629719 94.629719 ZT4-7 154.5692535 154.5692535 154.5692535 ZT8-11 258.58542 258.58542 258.58542 ZT12-15 168.858652 168.858652 168.858652 ZT16-19 104.00610599999999 104.00610599999999 104.00610599999999 ZT20-23 72.857412 72.857412 72.857412