condition mean min max ZT0-3 324.475038 324.475038 324.475038 ZT4-7 220.1569245 220.1569245 220.1569245 ZT8-11 183.6564645 183.6564645 183.6564645 ZT12-15 224.522604 224.522604 224.522604 ZT16-19 200.0453085 200.0453085 200.0453085 ZT20-23 313.016546 313.016546 313.016546