Short Answer 
The study highlights the negative impact of smartphones on adolescent happiness, revealing a significant decline in well-being since 2012, the year smartphone ownership rose above 50% in American households. Key points for Tana’s research include the link between increased screen time and lower self-esteem among young people.
Step 1: Understand the Study
The study emphasized how smartphones may negatively impact happiness levels, particularly among adolescents. It analyzed data from a national survey focused on self-esteem and happiness across three grades: 8th, 10th, and 12th. The findings revealed that while happiness levels were high in the 1990s, they significantly decreased in 2012, coinciding with the rise of smartphone ownership in American households.
Step 2: Analyze the Connection
2012 marked a pivotal year when smartphone usage surged, with more than half of households owning one. This increase in smartphone ownership correlated with a reported decline in adolescent well-being. The study indicated that spending more time on screens led to lower levels of happiness and self-esteem among young people, making this a critical aspect of Tana’s research.
Step 3: Identify Key Details for Tana
For Tana, writing about the popularity of cell phones, selecting the right details is vital. Useful information could include:
- “A study shows that smartphones can lead to unhappiness.”
- “This was the year when more than half of households in the country began to own smartphones.”
- “The report also shows that increased time spent on screens lowered the well-being of adolescents.”
These points directly connect smartphone popularity to its effects on adolescent happiness, aligning perfectly with her topic.