condition mean min max ZT0-3 38.8576 37.235749999999996 40.47945 ZT4-7 34.903099999999995 34.903099999999995 34.903099999999995 ZT8-11 52.828100000000006 52.828100000000006 52.828100000000006 ZT12-15 0 0 0 ZT16-19 59.837450000000004 59.837450000000004 59.837450000000004 ZT20-23 45.5839 45.5839 45.5839