condition mean min max ZT0-3 12.90335 11.197949999999999 14.85935 ZT4-7 12.8083 12.8083 12.8083 ZT8-11 26.21085 26.21085 26.21085 ZT12-15 37.414575 35.6017 39.22745 ZT16-19 28.0181 28.0181 28.0181 ZT20-23 18.28885 18.28885 18.28885