condition mean min max ZT0-3 12.658243 12.658243 12.658243 ZT4-7 13.523014 13.523014 13.523014 ZT8-11 13.4944485 13.4944485 13.4944485 ZT12-15 11.2791575 11.2791575 11.2791575 ZT16-19 11.774551500000001 11.774551500000001 11.774551500000001 ZT20-23 13.526689000000001 13.526689000000001 13.526689000000001