condition mean min max ZT0-3 148.106187 148.106187 148.106187 ZT4-7 136.0210965 136.0210965 136.0210965 ZT8-11 173.648123 173.648123 173.648123 ZT12-15 205.916745 205.916745 205.916745 ZT16-19 209.15290349999998 209.15290349999998 209.15290349999998 ZT20-23 193.1074105 193.1074105 193.1074105