condition mean min max ZT0-3 76.640341 76.640341 76.640341 ZT4-7 71.752261 71.752261 71.752261 ZT8-11 54.5294805 54.5294805 54.5294805 ZT12-15 49.423567500000004 49.423567500000004 49.423567500000004 ZT16-19 25.064317000000003 25.064317000000003 25.064317000000003 ZT20-23 32.145084 32.145084 32.145084