I've been reading an article on odds which gives odds of completing the draw on the turn and river.

e.g. set to a full house. 7 outs. 5.6:1 to complete on turn, 2.6:1 to complete on turn or river.

BUT the article says you can only use the 'turn or river' odds if you are going all in on the hand.

Why is this?

Thanks.