A Trend Study of Preterm Infant Mortality Rate in Developed and Developing Countries over 1990 to 2017.

A decreasing trend (slope) with different starting points in 1990 (intercepts) was seen in the trajectory plot of these countries, separately for each gender.

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However, the reported rate ratios in Table 3 tell us that the gap between the developed and developing countries had an increasing trend during this time [from 2.2 in 1990 to 2.69 in 2017].

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