condition mean min max ZT0-3 14.581849812999998 9.396171126 19.767528499999997 ZT4-7 12.0920271325 9.534782457999999 14.649271807 ZT8-11 11.07008409475 8.5839882525 13.556179937 ZT12-15 18.355702285 15.73922346 20.97218111 ZT16-19 23.736465467499997 20.882592735 26.590338199999998 ZT20-23 32.016332125 31.365100645 32.667563605