condition mean min max ZT0-3 6.050000000000001 6.050000000000001 6.050000000000001 ZT4-7 8.5 8.5 8.5 ZT8-11 9.95 9.95 9.95 ZT12-15 6.35 6.35 6.35 ZT16-19 9.15 9.15 9.15 ZT20-23 9.95 9.95 9.95