condition mean min max ZT0-3 20.708125 16.9422 24.47405 ZT4-7 24.03395 24.03395 24.03395 ZT8-11 12.150549999999999 12.150549999999999 12.150549999999999 ZT12-15 0 0 0 ZT16-19 15.889095000000001 15.889095000000001 15.889095000000001 ZT20-23 20.951900000000002 20.951900000000002 20.951900000000002