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The primary language is Bangla, called Bengali by most nonnatives, an Indo-European language spoken not just by Bangladeshis, but also by people who are culturally Bengali. This includes about 300 million people from Bangladesh, West Bengal, and Bihar, as well as Bengali speakers in other Indian states. The language dates from well before the birth of Christ. Bangla varies by region, and people may not understand the language of a person from another district. However, differences in dialect consist primarily of slight differences in accent or pronunciation and minor grammatical usages.

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Infant mortality is approximately seventy-five per one thousand live births. Life expectancy for both men and women is fifty-eight years, yet the sex ratios for cohorts above sixty years of age are skewed toward males. Girls between one and four years of age are almost twice as likely as boys to die.

In the early 1980s the annual rate of population increase was above 2.5 percent, but in the late 1990s it decreased to 1.9 percent. The success of population control may be due to the demographic transition (decreasing birth and death rates), decreasing farm sizes, increasing urbanization, and national campaigns to control fertility (funded largely by other nations).