condition mean min max ZT0-3 19.076336 19.076336 19.076336 ZT4-7 31.7036095 31.7036095 31.7036095 ZT8-11 35.973432 35.973432 35.973432 ZT12-15 42.1318645 42.1318645 42.1318645 ZT16-19 22.892819 22.892819 22.892819 ZT20-23 18.840317 18.840317 18.840317