According to Jake Najman's (1993)research,the rate of infant mortality for the poorest 20% of the population was four times higher than for the wealthiest 20% of the population.

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Jake Najman's research found that the rate of infant mortality for the poorest 20% of the population was indeed four times higher than for the wealthiest 20% of the population.

According to Jake Najman's (1993)research,the Rate of Infant Mortality for the Poorest