condition mean min max ZT0-3 0.4370806666666667 0.4370806666666667 0.4370806666666667 ZT4-7 0.271936 0.271936 0.271936 ZT8-11 0.0 0.0 0.0 ZT12-15 0.5803555 0.5803555 0.5803555 ZT16-19 0.0 0.0 0.0 ZT20-23 0.35065999999999997 0.35065999999999997 0.35065999999999997