condition mean min max ZT0-3 24.62325 16.0701 30.0263 ZT4-7 12.4678 12.4678 12.4678 ZT8-11 13.52755 13.52755 13.52755 ZT12-15 29.027925 22.58305 35.4728 ZT16-19 31.0573 31.0573 31.0573 ZT20-23 25.3074 25.3074 25.3074