condition mean min max ZT0-3 8.985183333333334 7.001234999999999 12.08005 ZT4-7 3.98164 3.98164 3.98164 ZT8-11 44.51735 44.51735 44.51735 ZT12-15 85.10640000000001 82.07480000000001 88.138 ZT16-19 51.083600000000004 51.083600000000004 51.083600000000004 ZT20-23 31.25335 31.25335 31.25335