condition mean min max ZT0-3 34.6265 34.6265 34.6265 ZT4-7 29.26215 29.26215 29.26215 ZT8-11 21.98865 21.98865 21.98865 ZT12-15 24.4254 24.4254 24.4254 ZT16-19 23.8578 23.8578 23.8578 ZT20-23 47.0419 47.0419 47.0419