condition mean min max ZT0-3 1890.313374 1890.313374 1890.313374 ZT4-7 2423.0379445 2423.0379445 2423.0379445 ZT8-11 2128.7989655 2128.7989655 2128.7989655 ZT12-15 2334.6041335 2334.6041335 2334.6041335 ZT16-19 3680.6338514999998 3680.6338514999998 3680.6338514999998 ZT20-23 3567.0642180000004 3567.0642180000004 3567.0642180000004