condition mean min max ZT0-3 1.1871842666666668 0.0 3.544035 ZT4-7 13.86985 13.86985 13.86985 ZT8-11 15.4657 15.4657 15.4657 ZT12-15 13.777032499999999 8.572965 18.981099999999998 ZT16-19 1.886285 1.886285 1.886285 ZT20-23 1.05973 1.05973 1.05973