condition mean min max ZT0-3 10.9216775 9.077404999999999 12.76595 ZT4-7 8.6264 8.6264 8.6264 ZT8-11 11.60623 11.60623 11.60623 ZT12-15 0 0 0 ZT16-19 12.67285 12.67285 12.67285 ZT20-23 10.57215 10.57215 10.57215