condition mean min max ZT0-3 32.92515 31.336550000000003 34.51375 ZT4-7 29.58755 29.58755 29.58755 ZT8-11 24.43925 24.43925 24.43925 ZT12-15 0 0 0 ZT16-19 35.193200000000004 35.193200000000004 35.193200000000004 ZT20-23 37.897850000000005 37.897850000000005 37.897850000000005