condition mean min max ZT0-3 17.95 17.95 17.95 ZT4-7 3.4 3.4 3.4 ZT8-11 23.7 23.7 23.7 ZT12-15 8.95 8.95 8.95 ZT16-19 32.85 32.85 32.85 ZT20-23 5.800000000000001 5.800000000000001 5.800000000000001