condition mean min max ZT0-3 121.700103 121.700103 121.700103 ZT4-7 95.753877 95.753877 95.753877 ZT8-11 112.875591 112.875591 112.875591 ZT12-15 110.373862 110.373862 110.373862 ZT16-19 114.727148 114.727148 114.727148 ZT20-23 121.133749 121.133749 121.133749