condition mean min max ZT0-3 11.526973333333334 8.68347 13.2217 ZT4-7 5.542120000000001 5.542120000000001 5.542120000000001 ZT8-11 6.07298 6.07298 6.07298 ZT12-15 12.3604625 10.452175 14.26875 ZT16-19 12.166 12.166 12.166 ZT20-23 14.56095 14.56095 14.56095