condition mean min max ZT0-3 7.9042316295 6.791079122 9.017384137 ZT4-7 14.331626405000002 12.89660566 15.76664715 ZT8-11 14.3869372075 14.203846215 14.5700282 ZT12-15 10.45857072175 9.818626273500001 11.098515169999999 ZT16-19 14.95455104 12.66453035 17.24457173 ZT20-23 22.99769982 20.989477255 25.005922384999998