condition mean min max ZT0-3 0.6639091666666667 0.262856 0.906817 ZT4-7 0.45641149999999997 0.45641149999999997 0.45641149999999997 ZT8-11 0.8065329999999999 0.8065329999999999 0.8065329999999999 ZT12-15 2.020165 1.5411299999999999 2.4992 ZT16-19 1.2913700000000001 1.2913700000000001 1.2913700000000001 ZT20-23 1.1955930000000001 1.1955930000000001 1.1955930000000001