condition mean min max ZT0-3 39.050000000000004 39.050000000000004 39.050000000000004 ZT4-7 5.8 5.8 5.8 ZT8-11 5.8999999999999995 5.8999999999999995 5.8999999999999995 ZT12-15 22.349999999999998 22.349999999999998 22.349999999999998 ZT16-19 6.4 6.4 6.4 ZT20-23 12.05 12.05 12.05