condition mean min max ZT0-3 9.538025 9.538025 9.538025 ZT4-7 10.746172 10.746172 10.746172 ZT8-11 10.449076 10.449076 10.449076 ZT12-15 10.138447 10.138447 10.138447 ZT16-19 11.9539675 11.9539675 11.9539675 ZT20-23 14.503231500000002 14.503231500000002 14.503231500000002