Same exact formula as how to tell if a toy is for boys or girls.
Over the past weekend, my oldest daughter went to one of our local comic book shops where she is learning how to play Pokémon Trading Card Game. Between the people perusing comics downstairs to the numerous gamers playing Pokémon, Warhammer 40,000 and various other titles upstairs, there was roughly 40 different customers in the store. She was the only girl.
Now at her school, her and her friends trade Pokémon cards. The people who do so are split pretty evenly down the middle: boys and girls, but as far as I know she’s the only one of her female friends who actually plays the game. All of her male friends who trade Pokémon cards also play the game, as well.
What does this mean? It could mean absolutely nothing. Maybe these other kids aren’t in a situation where they have someone to teach them or their parents do not have to time to take them somewhere to learn. Maybe they just want to collect them and not actually learn to play. Regardless, that the observation I’ve made from witnessing my own daughter and her friends, and thought the situation was worth sharing.