condition mean min max ZT0-3 37.54225 37.54225 37.54225 ZT4-7 39.13075 39.13075 39.13075 ZT8-11 24.83415 24.83415 24.83415 ZT12-15 24.95545 24.95545 24.95545 ZT16-19 28.04605 28.04605 28.04605 ZT20-23 33.3968 33.3968 33.3968