condition mean min max ZT0-3 38.961749999999995 38.961749999999995 38.961749999999995 ZT4-7 34.93235 34.93235 34.93235 ZT8-11 27.71425 27.71425 27.71425 ZT12-15 27.010550000000002 27.010550000000002 27.010550000000002 ZT16-19 32.0006 32.0006 32.0006 ZT20-23 35.44545 35.44545 35.44545