condition mean min max ZT0-3 6.485803832249999 5.636100647 7.3355070174999994 ZT4-7 9.602516534500001 8.117629309000002 11.08740376 ZT8-11 17.466285765000002 14.32523042 20.60734111 ZT12-15 23.5347513675 22.76743489 24.302067845 ZT16-19 19.3075172675 18.35994075 20.255093785 ZT20-23 19.9848938875 19.205906035 20.76388174