A study done in 2005 showed more accurate age results that were dependent on culture and gender. American women and men showed reminiscence bumps at age 13 and 17, respectively, while Dutch participants show a more progressive development of encoding strength around age 15. Studies with an identical methodology found peaks in the same period with Polish and Japanese participants. Supporting this study, there was research done that compared the distribution of memories of participants from Bangladesh, China, England, Japan, and the United States. The research found a greater number of childhood memories among American participants than in other cultural groups. While the timing of the reminiscence bump is generally thought to be culturally universal, with some minor difference in the period of life from which memories are recalled, there are studies that offer support for the notion that similar life scripts, at least for positive events, might also be found across different cultures.