condition mean min max ZT0-3 23.12935 10.75405 43.0244 ZT4-7 22.933799999999998 22.933799999999998 22.933799999999998 ZT8-11 22.9981 22.9981 22.9981 ZT12-15 18.66423 7.07226 30.2562 ZT16-19 8.371865 8.371865 8.371865 ZT20-23 8.66696 8.66696 8.66696