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0 - Not troubled with breathlessness except with strenuous exercise
1 - Troubled by shortness of breath when hurrying on the level or walking up a slight hill
2 - Walks slower than people of the same age on the level because of breathlessness or has to stop for breath when walking at own pace on the level
3 - Stops for breath after walking about 100 yards or after a few minutes on the level
4 - Too breathless to leave the house or breathless when dressing or undressing
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