condition mean min max ZT0-3 25.913698 25.913698 25.913698 ZT4-7 39.636039999999994 39.636039999999994 39.636039999999994 ZT8-11 57.755529499999994 57.755529499999994 57.755529499999994 ZT12-15 59.13444 59.13444 59.13444 ZT16-19 54.737211 54.737211 54.737211 ZT20-23 38.977433000000005 38.977433000000005 38.977433000000005