condition mean min max ZT0-3 5.6985 4.90222 6.49478 ZT4-7 7.059799999999999 7.059799999999999 7.059799999999999 ZT8-11 2.931025 2.931025 2.931025 ZT12-15 0 0 0 ZT16-19 7.870165 7.870165 7.870165 ZT20-23 7.659985000000001 7.659985000000001 7.659985000000001