condition mean min max ZT0-3 25.58577 25.58577 25.58577 ZT4-7 27.382953999999998 27.382953999999998 27.382953999999998 ZT8-11 27.056036 27.056036 27.056036 ZT12-15 23.4972345 23.4972345 23.4972345 ZT16-19 18.7975705 18.7975705 18.7975705 ZT20-23 17.2594005 17.2594005 17.2594005