condition mean min max ZT0-3 1152.370721 1152.370721 1152.370721 ZT4-7 887.9787225 887.9787225 887.9787225 ZT8-11 909.3905010000001 909.3905010000001 909.3905010000001 ZT12-15 1196.0193735 1196.0193735 1196.0193735 ZT16-19 1124.9218059999998 1124.9218059999998 1124.9218059999998 ZT20-23 902.4391285 902.4391285 902.4391285