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. 2011 May 6;6(5):e19648. doi: 10.1371/journal.pone.0019648

Table 3. Backward Stepwise Regression and Spatial Lag Regression models.

Backward Stepwise Regression (n = 97) Spatial Lag Regression (n = 97)
Unstandardized Coefficient Standard Error P-Value Unstandardized Coefficient Standard Error P Value
Syphilis
% adult population employed males * −2.016042 0.7411878 0.00782 −1.870957 0.722857 0.00965
% population unregistered* −0.2168563 0.06814441 0.00200 −0.2089737 0.06630818 0.00162
% population divorced males 1.40436 0.1703864 0.00000 1.359753 0.1663898 0.00000
Standard Of Living Index 0.3153882 0.07262007 0.00004 0.3085046 0.07063666 0.00001
% population aged 20–40 year old female* −0.2109721 0.06410162 0.00142 −0.2058472 0.062106 0.00092
Adjusted R squared 0.665383 0.685503
Spatial Parameter - 0.06211572 0.06435821 0.33447
Akaike Information Criterion 182.774 183.987
Log likelihood −85.3871 −84.9935
Gonorrhea
% adult population employed males * −3.893117 0.7919251 0 −3.750062 0.7856825 0
Illiteracy Rate −0.3450462 0.1250601 0.0070083 −0.3425638 0.1215131 0.0048152
% population divorced males 0.6118275 0.2212174 0.0068773 0.6097434 0.2139931 0.0043809
Standard Of Living Index 0.3267239 0.08492692 0.0002215 0.3204018 0.08245565 0.0001021
% population divorced females 0.6076922 0.1062824 0 0.5840591 0.1077762 0
Adjusted R squared 0.682448 0.700008
Spatial Parameter 0.04291393 0.07238207 0.5532609
Akaike Information Criterion 206.055 207.744000
Log likelihood −97.0275 −96.872100
Combined Syphilis and Gonorrhea Index (CSGI)
% adult population employed males * −5.885109 1.127263 0 −4.576749 1.109204 0
% population divorced males 1.452001 0.3225491 0 1.273677 0.3052852 0
% population divorced females 0.7257388 0.1781957 0 0.5770036 0.1709695 0.0007386
Standard Of Living Index 0.5815712 0.1176782 0 0.5326644 0.1112608 0
% population unregistered* −0.3482218 0.1114422 0.0023884 −0.3079282 0.1067888 0.0039326
Adjusted R squared 0.71437 0.747618
Spatial Parameter 0.241017 0.08202854 0.0033013
Akaike Information Criterion 275.639 271.411
Log likelihood −131.82 −128.705

*Inversely transformed variables.