condition mean min max ZT0-3 9.837505 9.837505 9.837505 ZT4-7 11.51572 11.51572 11.51572 ZT8-11 12.4776995 12.4776995 12.4776995 ZT12-15 10.868934 10.868934 10.868934 ZT16-19 10.91648 10.91648 10.91648 ZT20-23 9.647174 9.647174 9.647174