condition mean min max ZT0-3 12.649999999999999 12.649999999999999 12.649999999999999 ZT4-7 14.1 14.1 14.1 ZT8-11 35.85 35.85 35.85 ZT12-15 13.15 13.15 13.15 ZT16-19 16.3 16.3 16.3 ZT20-23 16.85 16.85 16.85