condition mean min max ZT0-3 16.047583333333336 11.5131 18.79315 ZT4-7 11.3659 11.3659 11.3659 ZT8-11 11.1517 11.1517 11.1517 ZT12-15 12.246974999999999 11.263549999999999 13.2304 ZT16-19 12.22405 12.22405 12.22405 ZT20-23 15.4965 15.4965 15.4965