condition mean min max ZT0-3 26.810850000000002 25.77855 27.84315 ZT4-7 20.46385 20.46385 20.46385 ZT8-11 9.57678 9.57678 9.57678 ZT12-15 0 0 0 ZT16-19 9.208275 9.208275 9.208275 ZT20-23 20.24115 20.24115 20.24115