condition mean min max ZT0-3 11.52225 11.52225 11.52225 ZT4-7 9.26407 9.26407 9.26407 ZT8-11 7.716305 7.716305 7.716305 ZT12-15 7.97921 7.97921 7.97921 ZT16-19 12.1847 12.1847 12.1847 ZT20-23 11.0008 11.0008 11.0008