In the story The Last Leaf by O'Henry Sue in order to cheer up Johnsy says that the doctor told her that Johnsy's chances of living were ten to one, but she then continues "Why,that's almost as good a chance as we have in New York when we ride on the street cars or walk past a new building." What did Sue means by the lines within quotes ?



The doctor interprets that if johnsy continued with her pessimistic behaviour she would have only one out of ten chances of her survival.
but in order to encourage johnsy and to boost her morale Sue turns the doctor's verdict the other way round that she had ten out of one chances of survival.
The lines mean that the according to sue her chances of survival were as good as aa person walking satisfied , hail and heartily in the busy streets of  new york 
But I wanted to ask what kind of satisfaction a person will havr while walking on the streets of NY ?
its just a similie that a prsn feels happy after walking down the lanes of NY.
Okay :D Thank you so much :)
wlcum :)