condition mean min max ZT0-3 254.01533333333333 170.638 419.422 ZT4-7 324.8035 324.8035 324.8035 ZT8-11 131.211 131.211 131.211 ZT12-15 46.607175 41.475300000000004 51.73905 ZT16-19 17.61195 17.61195 17.61195 ZT20-23 39.277100000000004 39.277100000000004 39.277100000000004