condition mean min max ZT0-3 14.0069 14.0069 14.0069 ZT4-7 10.84365 10.84365 10.84365 ZT8-11 8.323485 8.323485 8.323485 ZT12-15 9.28294 9.28294 9.28294 ZT16-19 11.9154 11.9154 11.9154 ZT20-23 13.2103 13.2103 13.2103