condition mean min max ZT0-3 3.0399000000000003 3.0399000000000003 3.0399000000000003 ZT4-7 1.546465 1.546465 1.546465 ZT8-11 2.98393 2.98393 2.98393 ZT12-15 2.691515 2.691515 2.691515 ZT16-19 5.89297 5.89297 5.89297 ZT20-23 4.10797 4.10797 4.10797