condition mean min max ZT0-3 3.95 3.95 3.95 ZT4-7 1.1 1.1 1.1 ZT8-11 14.649999999999999 14.649999999999999 14.649999999999999 ZT12-15 24.65 24.65 24.65 ZT16-19 5.95 5.95 5.95 ZT20-23 16.65 16.65 16.65