condition mean min max ZT0-3 71.389894 71.389894 71.389894 ZT4-7 89.228147 89.228147 89.228147 ZT8-11 117.4423075 117.4423075 117.4423075 ZT12-15 99.91735349999999 99.91735349999999 99.91735349999999 ZT16-19 115.10032100000001 115.10032100000001 115.10032100000001 ZT20-23 116.022473 116.022473 116.022473