condition mean min max ZT0-3 1.3966450000000001 1.0735649999999999 1.8560750000000001 ZT4-7 1.1044365 1.1044365 1.1044365 ZT8-11 1.96347 1.96347 1.96347 ZT12-15 2.67685 2.26316 3.09054 ZT16-19 2.615925 2.615925 2.615925 ZT20-23 1.65791 1.65791 1.65791