condition mean min max ZT0-3 4.70968 2.8012 6.61816 ZT4-7 5.19259 5.19259 5.19259 ZT8-11 4.65813 4.65813 4.65813 ZT12-15 0 0 0 ZT16-19 6.309045 6.309045 6.309045 ZT20-23 6.119605 6.119605 6.119605