condition mean min max ZT0-3 4.3719850000000005 4.3719850000000005 4.3719850000000005 ZT4-7 1.8205049999999998 1.8205049999999998 1.8205049999999998 ZT8-11 5.282915 5.282915 5.282915 ZT12-15 11.4193 11.4193 11.4193 ZT16-19 12.7472 12.7472 12.7472 ZT20-23 6.292085 6.292085 6.292085