condition mean min max ZT0-3 36.68383413 36.47018132 36.89748694 ZT4-7 20.709697935 20.488008955 20.931386915 ZT8-11 20.876873005 19.034156165 22.719589845 ZT12-15 28.124393025000003 23.987848105 32.260937945 ZT16-19 31.713137912500002 31.623954075 31.80232175 ZT20-23 32.6071845825 30.962524469999998 34.251844695