condition mean min max ZT0-3 10.1389 10.1389 10.1389 ZT4-7 11.2224155 11.2224155 11.2224155 ZT8-11 11.374849 11.374849 11.374849 ZT12-15 11.123672 11.123672 11.123672 ZT16-19 11.730706999999999 11.730706999999999 11.730706999999999 ZT20-23 11.6396665 11.6396665 11.6396665