condition mean min max ZT0-3 19.474553 19.474553 19.474553 ZT4-7 35.9958825 35.9958825 35.9958825 ZT8-11 38.495273 38.495273 38.495273 ZT12-15 31.4313855 31.4313855 31.4313855 ZT16-19 22.205452 22.205452 22.205452 ZT20-23 11.258977 11.258977 11.258977