condition mean min max ZT0-3 10.454508 10.454508 10.454508 ZT4-7 10.857336 10.857336 10.857336 ZT8-11 10.5010865 10.5010865 10.5010865 ZT12-15 10.884855 10.884855 10.884855 ZT16-19 11.885976 11.885976 11.885976 ZT20-23 9.510847 9.510847 9.510847