condition mean min max ZT0-3 26.093625000000003 25.20895 26.9783 ZT4-7 27.9757 27.9757 27.9757 ZT8-11 22.0503 22.0503 22.0503 ZT12-15 0 0 0 ZT16-19 20.0867 20.0867 20.0867 ZT20-23 24.87595 24.87595 24.87595