condition mean min max ZT0-3 35.14533333333333 19.4284 44.70165 ZT4-7 19.950400000000002 19.950400000000002 19.950400000000002 ZT8-11 21.35755 21.35755 21.35755 ZT12-15 32.1729 29.50205 34.84375 ZT16-19 41.88725 41.88725 41.88725 ZT20-23 49.05555 49.05555 49.05555