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Table 1 Linear regression models for preterm birth rates, according to gestational age and Macro-regional. Paraná, Brazil, 2000-2013

From: The inner state differences of preterm birth rates in Brazil: a time series study

Center-east-south

Model

R2

p

Trend

<37 weeks

y = 6.06 + 0.13x + 0.06x2

0.89

<0.001

Growing

<28 weeks

y = 0.42 + 0.01x + 0.002x2

0.91

<0.001

Growing

28 - <32

y = 0.67 + 0.01x + 0.004x2

0.90

<0.001

Growing

32 - <37

y = 4.98 + 0.11x + 0.06x2

0.89

<0.001

Growing

West

    

<37 weeks

y = 6.26 + 0.17x + 0.06x2

0.76

0.001

Growing

<28 weeks

y = 0.41 + 0.01x

0.64

0.002

Growing

28 - <32

y = 0.78-0.003x

0.04

0.558

Constant

32 - <37

y = 5.06 + 0.16x + 0.06x2

0.79

<0.001

Growing

Northeast

    

<37 weeks

y = 6.70 + 0.27x + 0.05x2

0.96

<0.001

Growing

<28 weeks

y = 0.44 + 0.01x

0.92

<0.001

Growing

28 - <32

y = 0.71 + 0.02x

0.88

<0.001

Growing

32 - <37

y = 6.14 + 0.29x

0.75

<0.001

Growing

North

    

<37 weeks

y = 7.55 + 0.35x

0.86

<0.001

Growing

<28 weeks

y = 0.48 + 0.01x

0.70

0.001

Growing

28 - <32

y = 0.79 + 0.02x

0.76

<0.001

Growing

32 - <37

y = 6.28 + 0.33x

0.85

<0.001

Growing