condition mean min max ZT0-3 57.107247 57.107247 57.107247 ZT4-7 41.900757 41.900757 41.900757 ZT8-11 40.052741 40.052741 40.052741 ZT12-15 46.963954 46.963954 46.963954 ZT16-19 59.9880635 59.9880635 59.9880635 ZT20-23 62.3586795 62.3586795 62.3586795