condition mean min max ZT0-3 26.874675 25.536949999999997 28.212400000000002 ZT4-7 34.8852 34.8852 34.8852 ZT8-11 37.53185 37.53185 37.53185 ZT12-15 0 0 0 ZT16-19 48.21835 48.21835 48.21835 ZT20-23 37.0141 37.0141 37.0141