Odd that we see so many articles like this on HN. Do the studies factor in introverts vs. extroverts? Do the studies factor in intelligence? Do the studies f

Odd that we see so many articles like this on HN. Do the studies factor in introverts vs. extroverts? Do the studies factor in intelligence? Do the studies factor in people that have been alone for nearly all their life? And what about pets? Are they useful in alleviating loneliness?