尼日利亚统计局：第一季度国内生产总值同比增长3.13%。

Group 1 - The core point of the article is that Nigeria's Gross Domestic Product (GDP) grew by 3.13% year-on-year in the first quarter [1] Group 2 - The growth rate indicates a positive economic trend for Nigeria, suggesting resilience in the face of potential challenges [1] - This growth figure may influence investor sentiment and economic policies moving forward [1] - The statistics provided by the National Bureau of Statistics highlight the ongoing recovery and development within the Nigerian economy [1]