condition mean min max ZT0-3 174.193917 174.193917 174.193917 ZT4-7 149.54959250000002 149.54959250000002 149.54959250000002 ZT8-11 166.09190949999999 166.09190949999999 166.09190949999999 ZT12-15 157.1689205 157.1689205 157.1689205 ZT16-19 195.661711 195.661711 195.661711 ZT20-23 213.062302 213.062302 213.062302