condition mean min max ZT0-3 20.097275000000003 20.0637 20.130850000000002 ZT4-7 17.43705 17.43705 17.43705 ZT8-11 11.66215 11.66215 11.66215 ZT12-15 0 0 0 ZT16-19 18.69155 18.69155 18.69155 ZT20-23 17.63935 17.63935 17.63935