More recent studies have shown significant links between spaying / neutering in dogs and behavioral problems, thyroid issues, and even increased incidence of several potentially fatal types of cancer. (animalkindvet.com)
The one factor with a statistically significant link to minor depression was having a high school education or less. (health.com)
Past studies have found significant links between higher levels of CU traits and more difficult parent — child relationships [14, 17], and child attachment disturbances [18, 19, 20]. (link.springer.com)