condition mean min max ZT0-3 6.35 6.35 6.35 ZT4-7 9.7 9.7 9.7 ZT8-11 8.95 8.95 8.95 ZT12-15 8.85 8.85 8.85 ZT16-19 27.7 27.7 27.7 ZT20-23 7.050000000000001 7.050000000000001 7.050000000000001