condition mean min max ZT0-3 11.074471 11.074471 11.074471 ZT4-7 11.741833 11.741833 11.741833 ZT8-11 11.074471 11.074471 11.074471 ZT12-15 11.0036515 11.0036515 11.0036515 ZT16-19 10.4691475 10.4691475 10.4691475 ZT20-23 10.591752 10.591752 10.591752