condition mean min max ZT0-3 264.526968 264.526968 264.526968 ZT4-7 229.6247085 229.6247085 229.6247085 ZT8-11 273.435203 273.435203 273.435203 ZT12-15 275.13914950000003 275.13914950000003 275.13914950000003 ZT16-19 332.37195399999996 332.37195399999996 332.37195399999996 ZT20-23 317.31229099999996 317.31229099999996 317.31229099999996