condition mean min max ZT0-3 21.177304372499997 17.4833914 24.871217344999998 ZT4-7 35.195683697499994 34.009626354999995 36.381741039999994 ZT8-11 51.68666478 45.48369006 57.8896395 ZT12-15 75.6500785825 73.2585256 78.041631565 ZT16-19 60.2327764075 58.93937196 61.526180855 ZT20-23 51.7237716825 51.33652793 52.111015435