measuring frozen vegetable portions

I am unsure how to specify the amount of food when I am eating frozen vegetables. For instance, if I enter 12.6 oz of broccoli, the amount listed on the package, I get one result. If I cook the broccoli and enter the cooked amount in cups, as measured by me, I get a completely different result.
Which method is the accurate one in terms of nutrients? Should I measure the food in its frozen state, or cooked?

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