condition mean min max ZT0-3 56.80935 48.39175 65.22695 ZT4-7 23.027749999999997 23.027749999999997 23.027749999999997 ZT8-11 26.1839 26.1839 26.1839 ZT12-15 0 0 0 ZT16-19 44.512649999999994 44.512649999999994 44.512649999999994 ZT20-23 47.4023 47.4023 47.4023