condition mean min max ZT0-3 867.8 867.8 867.8 ZT4-7 731.0 731.0 731.0 ZT8-11 648.0999999999999 648.0999999999999 648.0999999999999 ZT12-15 789.5 789.5 789.5 ZT16-19 896.8 896.8 896.8 ZT20-23 967.4 967.4 967.4