condition mean min max ZT0-3 136.869866 136.869866 136.869866 ZT4-7 145.473615 145.473615 145.473615 ZT8-11 159.6517745 159.6517745 159.6517745 ZT12-15 179.27144099999998 179.27144099999998 179.27144099999998 ZT16-19 241.847982 241.847982 241.847982 ZT20-23 218.28126650000002 218.28126650000002 218.28126650000002