condition mean min max ZT0-3 15.157149 15.157149 15.157149 ZT4-7 16.691218499999998 16.691218499999998 16.691218499999998 ZT8-11 49.231044999999995 49.231044999999995 49.231044999999995 ZT12-15 28.675038 28.675038 28.675038 ZT16-19 132.1291375 132.1291375 132.1291375 ZT20-23 108.280933 108.280933 108.280933