condition mean min max ZT0-3 4.725725 4.725725 4.725725 ZT4-7 3.9261850000000003 3.9261850000000003 3.9261850000000003 ZT8-11 3.79439 3.79439 3.79439 ZT12-15 4.0555 4.0555 4.0555 ZT16-19 5.78387 5.78387 5.78387 ZT20-23 4.939215 4.939215 4.939215