condition mean min max ZT0-3 14.137558333333335 6.7661750000000005 19.4185 ZT4-7 4.087875 4.087875 4.087875 ZT8-11 6.854635 6.854635 6.854635 ZT12-15 15.477975 13.57315 17.3828 ZT16-19 15.45215 15.45215 15.45215 ZT20-23 19.5604 19.5604 19.5604