condition mean min max ZT0-3 40.81285 35.9037 45.722 ZT4-7 16.21705 16.21705 16.21705 ZT8-11 11.44045 11.44045 11.44045 ZT12-15 0 0 0 ZT16-19 21.2631 21.2631 21.2631 ZT20-23 24.68405 24.68405 24.68405