National surveys on stress were conducted in 1983, 2006, and 2009. The findings showed that for men, mean stress scores increased steadily from approximately 12 in 1983 to just over 15 in 2009. For women, scores rose sharply from under 13 in 1983 to 16 in 2006, a level that remained stable in 2009. Based on these trends, which of the following statements represents the most accurate analysis of the data?