condition mean min max ZT0-3 11.372658333333334 4.7318750000000005 15.15355 ZT4-7 5.71687 5.71687 5.71687 ZT8-11 5.95274 5.95274 5.95274 ZT12-15 8.2845975 7.77183 8.797365 ZT16-19 11.29195 11.29195 11.29195 ZT20-23 16.30485 16.30485 16.30485