condition mean min max ZT0-3 11.255749999999999 11.255749999999999 11.255749999999999 ZT4-7 5.6141749999999995 5.6141749999999995 5.6141749999999995 ZT8-11 7.194235 7.194235 7.194235 ZT12-15 8.457775 8.457775 8.457775 ZT16-19 12.49095 12.49095 12.49095 ZT20-23 14.489799999999999 14.489799999999999 14.489799999999999