condition mean min max ZT0-3 27.8 27.8 27.8 ZT4-7 9.4 9.4 9.4 ZT8-11 6.3500000000000005 6.3500000000000005 6.3500000000000005 ZT12-15 14.95 14.95 14.95 ZT16-19 66.15 66.15 66.15 ZT20-23 31.349999999999998 31.349999999999998 31.349999999999998