condition mean min max ZT0-3 5.65885 4.602215 6.715485 ZT4-7 4.09665 4.09665 4.09665 ZT8-11 16.49045 16.49045 16.49045 ZT12-15 0 0 0 ZT16-19 16.756999999999998 16.756999999999998 16.756999999999998 ZT20-23 10.08022 10.08022 10.08022