condition mean min max ZT0-3 32.822269 32.822269 32.822269 ZT4-7 37.4145305 37.4145305 37.4145305 ZT8-11 58.1705355 58.1705355 58.1705355 ZT12-15 38.142691 38.142691 38.142691 ZT16-19 50.948573999999994 50.948573999999994 50.948573999999994 ZT20-23 48.9919175 48.9919175 48.9919175