condition mean min max ZT0-3 52.540468 52.540468 52.540468 ZT4-7 44.1196365 44.1196365 44.1196365 ZT8-11 33.3722645 33.3722645 33.3722645 ZT12-15 28.802774499999998 28.802774499999998 28.802774499999998 ZT16-19 30.8857885 30.8857885 30.8857885 ZT20-23 28.570183 28.570183 28.570183