condition mean min max ZT0-3 234.85000000000002 234.85000000000002 234.85000000000002 ZT4-7 326.9 326.9 326.9 ZT8-11 273.0 273.0 273.0 ZT12-15 377.75 377.75 377.75 ZT16-19 306.45000000000005 306.45000000000005 306.45000000000005 ZT20-23 261.0 261.0 261.0