condition mean min max ZT0-3 12.256312 12.256312 12.256312 ZT4-7 12.728823 12.728823 12.728823 ZT8-11 12.728679 12.728679 12.728679 ZT12-15 11.310316 11.310316 11.310316 ZT16-19 12.6218395 12.6218395 12.6218395 ZT20-23 14.775559999999999 14.775559999999999 14.775559999999999