condition mean min max ZT0-3 4.819178679749999 4.351083706 5.2872736535 ZT4-7 8.78843415075 7.0919598530000005 10.4849084485 ZT8-11 14.3495831175 11.83963456 16.859531675 ZT12-15 10.01323514025 7.726464129 12.3000061515 ZT16-19 6.50238413125 6.4758422035 6.528926059 ZT20-23 6.91892700125 6.866081653 6.9717723495