condition mean min max ZT0-3 4.743875 4.743875 4.743875 ZT4-7 3.51505 3.51505 3.51505 ZT8-11 3.353145 3.353145 3.353145 ZT12-15 4.138535 4.138535 4.138535 ZT16-19 4.2367 4.2367 4.2367 ZT20-23 4.801975 4.801975 4.801975