condition mean min max ZT0-3 13.346743333333334 6.48958 17.288600000000002 ZT4-7 11.495899999999999 11.495899999999999 11.495899999999999 ZT8-11 13.7439 13.7439 13.7439 ZT12-15 10.639277499999999 9.924154999999999 11.3544 ZT16-19 15.155100000000001 15.155100000000001 15.155100000000001 ZT20-23 22.7931 22.7931 22.7931