condition mean min max ZT0-3 4097.543333 4097.543333 4097.543333 ZT4-7 5039.495 5039.495 5039.495 ZT8-11 3945.615 3945.615 3945.615 ZT12-15 2882.788889 2882.788889 2882.788889 ZT16-19 2667.7411110000003 2667.7411110000003 2667.7411110000003 ZT20-23 3193.964444333333 3193.964444333333 3193.964444333333