condition mean min max ZT0-3 46.93873333333334 44.22485 51.90205 ZT4-7 15.77045 15.77045 15.77045 ZT8-11 2.572015 2.572015 2.572015 ZT12-15 1.6133475 1.041465 2.18523 ZT16-19 2.153615 2.153615 2.153615 ZT20-23 5.45982 5.45982 5.45982