condition mean min max ZT0-3 6.386485 6.386485 6.386485 ZT4-7 9.297905 9.297905 9.297905 ZT8-11 10.693995000000001 10.693995000000001 10.693995000000001 ZT12-15 5.758045 5.758045 5.758045 ZT16-19 3.848185 3.848185 3.848185 ZT20-23 4.560005 4.560005 4.560005