condition mean min max ZT0-3 306.539749 306.539749 306.539749 ZT4-7 255.161154 255.161154 255.161154 ZT8-11 269.8233765 269.8233765 269.8233765 ZT12-15 284.154942 284.154942 284.154942 ZT16-19 413.8210875 413.8210875 413.8210875 ZT20-23 484.2183585 484.2183585 484.2183585