condition mean min max ZT0-3 92.770558 92.770558 92.770558 ZT4-7 173.3656675 173.3656675 173.3656675 ZT8-11 178.3902285 178.3902285 178.3902285 ZT12-15 129.90431949999999 129.90431949999999 129.90431949999999 ZT16-19 161.463126 161.463126 161.463126 ZT20-23 128.665075 128.665075 128.665075