condition mean min max ZT0-3 48.71445 48.71445 48.71445 ZT4-7 31.5217 31.5217 31.5217 ZT8-11 28.141150000000003 28.141150000000003 28.141150000000003 ZT12-15 27.481350000000003 27.481350000000003 27.481350000000003 ZT16-19 35.3391 35.3391 35.3391 ZT20-23 36.06355 36.06355 36.06355