condition mean min max ZT0-3 17.804728 17.804728 17.804728 ZT4-7 16.814884 16.814884 16.814884 ZT8-11 13.197061999999999 13.197061999999999 13.197061999999999 ZT12-15 14.933802 14.933802 14.933802 ZT16-19 14.114354 14.114354 14.114354 ZT20-23 13.1479295 13.1479295 13.1479295