condition mean min max ZT0-3 10.443732 10.443732 10.443732 ZT4-7 13.187626999999999 13.187626999999999 13.187626999999999 ZT8-11 13.256098999999999 13.256098999999999 13.256098999999999 ZT12-15 12.654824000000001 12.654824000000001 12.654824000000001 ZT16-19 13.128296 13.128296 13.128296 ZT20-23 15.262972999999999 15.262972999999999 15.262972999999999