condition mean min max ZT0-3 102.193213 102.193213 102.193213 ZT4-7 113.041658 113.041658 113.041658 ZT8-11 107.71773300000001 107.71773300000001 107.71773300000001 ZT12-15 106.6541805 106.6541805 106.6541805 ZT16-19 168.0549105 168.0549105 168.0549105 ZT20-23 151.7478905 151.7478905 151.7478905