condition mean min max ZT0-3 4.84825 4.84825 4.84825 ZT4-7 5.15831 5.15831 5.15831 ZT8-11 3.972585 3.972585 3.972585 ZT12-15 4.78531 4.78531 4.78531 ZT16-19 5.676185 5.676185 5.676185 ZT20-23 5.816875 5.816875 5.816875