condition mean min max ZT0-3 604.118434 604.118434 604.118434 ZT4-7 526.492495 526.492495 526.492495 ZT8-11 401.270374 401.270374 401.270374 ZT12-15 413.481673 413.481673 413.481673 ZT16-19 406.948046 406.948046 406.948046 ZT20-23 271.35957099999996 271.35957099999996 271.35957099999996