condition mean min max ZT0-3 342.846978 342.846978 342.846978 ZT4-7 264.8918115 264.8918115 264.8918115 ZT8-11 296.709787 296.709787 296.709787 ZT12-15 255.20256849999998 255.20256849999998 255.20256849999998 ZT16-19 365.5300355 365.5300355 365.5300355 ZT20-23 369.57604949999995 369.57604949999995 369.57604949999995