condition mean min max ZT0-3 30.105449999999998 28.400199999999998 31.8107 ZT4-7 39.8666 39.8666 39.8666 ZT8-11 39.04835 39.04835 39.04835 ZT12-15 0 0 0 ZT16-19 34.43675 34.43675 34.43675 ZT20-23 33.6839 33.6839 33.6839