condition mean min max ZT0-3 8.1829325 7.579015 8.78685 ZT4-7 11.4504 11.4504 11.4504 ZT8-11 12.38025 12.38025 12.38025 ZT12-15 0 0 0 ZT16-19 14.024149999999999 14.024149999999999 14.024149999999999 ZT20-23 12.3578 12.3578 12.3578