we often find it convenient to use descriptions of others, say when we're looking for them, "he's about 170-175 cm tall, thinly built, but not just skin and bones." But we won't list in the IC, unless there's a data sheet available IC, stuff like "he is 172.83 cm tall and weighs 74.021 kg". The reason we would not list that is that IC our character(s) would not have that precise numbers under most conditions.