condition mean min max ZT0-3 3.2550725000000003 2.4977650000000002 4.01238 ZT4-7 3.03064 3.03064 3.03064 ZT8-11 2.767285 2.767285 2.767285 ZT12-15 0 0 0 ZT16-19 5.915915 5.915915 5.915915 ZT20-23 4.263765 4.263765 4.263765