condition mean min max ZT0-3 2.95 2.95 2.95 ZT4-7 9.6 9.6 9.6 ZT8-11 25.75 25.75 25.75 ZT12-15 8.100000000000001 8.100000000000001 8.100000000000001 ZT16-19 2.6 2.6 2.6 ZT20-23 5.35 5.35 5.35