condition mean min max ZT0-3 32.1 32.1 32.1 ZT4-7 4.4 4.4 4.4 ZT8-11 14.75 14.75 14.75 ZT12-15 16.85 16.85 16.85 ZT16-19 22.849999999999998 22.849999999999998 22.849999999999998 ZT20-23 18.0 18.0 18.0