Final answer:
According to Jake Najman's 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.
Step-by-step explanation:
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.Infant mortality refers to the number of deaths of infants under one year old per 1,000 live births. The research suggests that there is an inverse correlation between a nation's wealth and its infant mortality rate, meaning that poorer populations tend to experience higher rates of infant mortality. The statistic highlights the impact of socioeconomic disparities on the health outcomes of different population groups.