condition mean min max ZT0-3 7.1456675 7.137655 7.15368 ZT4-7 5.946075 5.946075 5.946075 ZT8-11 7.040635 7.040635 7.040635 ZT12-15 0 0 0 ZT16-19 14.1455 14.1455 14.1455 ZT20-23 8.66351 8.66351 8.66351