condition mean min max ZT0-3 8.157944 8.157944 8.157944 ZT4-7 10.381664 10.381664 10.381664 ZT8-11 9.471733 9.471733 9.471733 ZT12-15 8.78611 8.78611 8.78611 ZT16-19 9.539116 9.539116 9.539116 ZT20-23 9.370837 9.370837 9.370837