condition mean min max ZT0-3 6.265499999999999 6.265499999999999 6.265499999999999 ZT4-7 5.91559 5.91559 5.91559 ZT8-11 4.749835 4.749835 4.749835 ZT12-15 4.91394 4.91394 4.91394 ZT16-19 4.924635 4.924635 4.924635 ZT20-23 5.430065 5.430065 5.430065