condition mean min max ZT0-3 10.337273 10.337273 10.337273 ZT4-7 11.5216895 11.5216895 11.5216895 ZT8-11 12.309496 12.309496 12.309496 ZT12-15 11.938247 11.938247 11.938247 ZT16-19 12.1232155 12.1232155 12.1232155 ZT20-23 10.8430255 10.8430255 10.8430255