condition mean min max ZT0-3 9.734453 9.734453 9.734453 ZT4-7 11.3762045 11.3762045 11.3762045 ZT8-11 11.775088 11.775088 11.775088 ZT12-15 10.4876065 10.4876065 10.4876065 ZT16-19 10.424496999999999 10.424496999999999 10.424496999999999 ZT20-23 9.757064499999998 9.757064499999998 9.757064499999998