A Furry Conclusion to Long-term Average Treatment Effects

A recent study tried to find out who loves their owners more: cats or dogs. The study had a random sample of cat and dog owners play with their pets for 10 minutes, and measured changes in the pets' levels of oxytocin, often referred to as the "happy hormone."

Immediately after 10 minutes of play, dogs had a 56% increase in oxytocin levels, whereas cats only had a 12% increase in oxytocin levels. However, after another 60 minutes of rest, both animal's oxytocin levels were only 5% higher than they were prior to play.

What is an accurate summary of the results of this experiment?

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The short-term average treatment effect of play on cats' and dogs' oxytocin levels is much larger for cats than for dogs, but the long-term average treatment effect of play on cats and dogs oxytocin levels is identical.
The short-term average treatment effect of play on cats' and dogs' oxytocin levels is much larger for dogs than for cats, but the long-term average treatment effect of play on cats and dogs oxytocin levels is identical.
The short-term average treatment effect of play on cats' and dogs' oxytocin levels is identical, but the long-term average treatment effect of play on pets' oxytocin levels is much larger for dogs than for cats.
The short-term average treatment effect of play on cats' and dogs' oxytocin levels is identical, but the long-term average treatment effect of play on pets' oxytocin levels is much larger for cats than for dogs.

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A Furry Conclusion to Long-term Average Treatment Effects

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