condition mean min max ZT0-3 0.9184235 0.6905745000000001 1.038822 ZT4-7 0.6573615 0.6573615 0.6573615 ZT8-11 0.57982 0.57982 0.57982 ZT12-15 0.84666775 0.8166500000000001 0.8766855 ZT16-19 0.6517855 0.6517855 0.6517855 ZT20-23 1.3201749999999999 1.3201749999999999 1.3201749999999999