condition mean min max ZT0-3 15.653346 15.653346 15.653346 ZT4-7 16.123745500000002 16.123745500000002 16.123745500000002 ZT8-11 17.172497 17.172497 17.172497 ZT12-15 13.0513655 13.0513655 13.0513655 ZT16-19 16.676633000000002 16.676633000000002 16.676633000000002 ZT20-23 15.0400795 15.0400795 15.0400795