condition mean min max ZT0-3 14.934925000000002 13.792100000000001 16.07775 ZT4-7 13.2348 13.2348 13.2348 ZT8-11 14.025649999999999 14.025649999999999 14.025649999999999 ZT12-15 0 0 0 ZT16-19 18.2633 18.2633 18.2633 ZT20-23 16.95835 16.95835 16.95835