condition mean min max ZT0-3 17.666168 17.666168 17.666168 ZT4-7 22.03993 22.03993 22.03993 ZT8-11 14.2747985 14.2747985 14.2747985 ZT12-15 16.4104155 16.4104155 16.4104155 ZT16-19 11.897788 11.897788 11.897788 ZT20-23 14.2367395 14.2367395 14.2367395