APPENDIX 1 A study examined families in three major cities in Thailand. The study focused on infant development in the context of the backgrounds and living conditions of families. 269 observations with complete observations are included in this analysis. Investigators studied predictors of infant behavioral characteristics. One of the characteristics "Excitability" was measured as the number of times an infant acted "excited" in a on hour period of time. Potential predictors included the baby's gestational age (gestation_weeks), the quality of the families living conditions (qols), mother's language-free nonverbal intelligence (TONI4_INDEX), the numbers of years of education of the father (FatherYrsEduc), the number of preterm births the mother had experienced (Preterm), and infant sex (0-female, 1-male). Below is relevant SAS Output. 0.0160 The GENMOD Procedure Model Information Data Set WORK.ALL MERGED Distribution Poisson Link Function Log Dependent Variable Excitability Number of Observations Read320 Number of Observations Used269 Missing Values Parameter Information ParameterEffect 51 Prml Intercept Prm2 gestation_weeks Prm3 Qols Prm4 TONI4_INDEX Prm5 Father YrsEduc Prm6 Preterm Prm7 Infantsex Criteria For Assessing Goodness Of Fit Criterion DF Value Value/DF Deviance 262 577.3168 2.2035 Scaled Deviance 262 577.3168 2.2035 Pearson Chi-Square Scaled Pearson X2 Log Likelihood Full Log Likelihood AIC (smaller is better) 262 566.3297 2.1616 262 566.3297 2.1616 -248.4164 -463.6072 941.2145 AICC (smaller is better) 941.6436 966.3774 BIC (smaller is better) Algorithm converged. Analysis Of Maximum Likelihood Parameter Estimates Standard Wald 95% Confidence Parameter Wald Chi- DF Estimate Intercept 1 0.2324 Error 1.8543 Limits Square Pr> ChiSq -3.4020 3.8667 0.02 0.9003 gestation_weeks 1 -0.0190 0.0474 -0.1120 0.0739 0.16 0.6881 qols 1 -0.1267 0.0958 -0.3145 0.0610 1.75 0.1858 TONI4_INDEX 1 0.0034 0.0072 -0.0106 0.0174 0.22 0.6366 Father YrsEduc 1 0.0454 0.0150 0.0160 0.0748 9.14 0.0025 Preterm 1 -0.8756 0.3012 -1.4660 -0.2853 8.45 0.0036 infantsex 1 0.0712 0.1102 -0.1448 0.2871 0.42 0.5184 Scale 0 1.0000 0.0000 1.0000 1.0000 Note: The scale parameter was held fixed.