condition mean min max ZT0-3 165.261363 165.261363 165.261363 ZT4-7 139.2374465 139.2374465 139.2374465 ZT8-11 135.886907 135.886907 135.886907 ZT12-15 151.89923700000003 151.89923700000003 151.89923700000003 ZT16-19 118.17906550000001 118.17906550000001 118.17906550000001 ZT20-23 126.363859 126.363859 126.363859