There’s a reason that studies that depend on direct observation/measurement often differ in their results from studies that depend on self-reporting by the group being studied — because people lie:
Many mothers are under so much pressure to appear like perfect parents that they cover up how much television their children watch or what they cook their families, according to a survey.
Such “white lies” also extend to how much “quality time” mothers spend with their partner, website Netmums said its survey of 5,000 people suggested.
The parenting site said mothers often made each other feel “inadequate”.
[. . .]
Almost two-thirds of those surveyed said they had been less than honest with other mothers about how well they were coping and almost half covered up financial worries.
Almost a quarter of mothers admitted to downplaying how much television their children actually watched — and one in five “span a yarn” over how long they played with their children.