condition mean min max ZT0-3 246.60616666666667 150.469 314.3615 ZT4-7 165.3095 165.3095 165.3095 ZT8-11 61.639250000000004 61.639250000000004 61.639250000000004 ZT12-15 74.521925 68.8365 80.20734999999999 ZT16-19 87.71045000000001 87.71045000000001 87.71045000000001 ZT20-23 173.2725 173.2725 173.2725