condition mean min max ZT0-3 171.931956825 110.8966077 232.96730594999997 ZT4-7 323.824179525 304.6235986 343.02476045000003 ZT8-11 275.87398727499993 274.95846729999994 276.78950724999993 ZT12-15 189.36736115000002 161.48742710000002 217.2472952 ZT16-19 102.47113630249999 97.633918775 107.30835382999999 ZT20-23 66.135078615 51.21296236 81.05719487