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Table 1 Results from Box-Cox models in which (IMRλ-1)/λ is regressed against time

From: Are infant mortality rate declines exponential? The general pattern of 20th century infant mortality rate decline

Country Years λ Chi-squared for null that λ= 0
(Logarithmic model)
Chi-squared for null that λ= 1
(Linear Model)
Whole sample   0.077 (22.050) *** (2131.57) ***
Australia 1921–1999 0.249 (37.750) *** (153.650) ***
Austria 1947–1999 0.102 (9.200) *** (165.330) ***
Belgium 1900–1913
1918–1999
0.379 (67.180) *** (130.450) ***
Canada 1921–1999 0.151 (50.290) *** (288.830) ***
Denmark 1900–1999 0.260 (40.530) *** (169.090) ***
Finland 1900–1999 0.356 (58.640) *** (130.600) ***
France 1900–1999 0.354 (52.030) *** (118.600) ***
Italy 1900–1999 0.587 (122.850) *** (63.540) ***
Japan 1947–1999 -0.321 (62.000) *** (238.210) ***
Netherlands 1900–1999 -0.092 (10.680) *** (342.410) ***
New Zealand 1947–1999 0.591 (49.640) *** (27.030) ***
Norway 1900–1999 0.364 (90.730) *** (169.360) ***
Portugal 1940–1999 0.523 (74.340) *** (64.170) ***
Spain 1908–1999 0.450 (71.570) *** (82.540) ***
Sweden 1900–1999 0.192 (39.310) *** (234.810) ***
Switzerland 1900–1999 0.133 (41.060) *** (352.000) ***
UK 1900–1999 0.136 (34.220) *** (310.440) ***
USA 1933–1999 0.040 (0.990) (168.680) ***
  1. No mortality data are available for Belgium from 1914–1918. USA has IMR time series that is best fit as logarithmic. ***p < 0.01 for likelihood ratio test for null that λ = 0 and λ = 1.