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Table 3 Negative Binomial regression coefficients for factors affecting the initial number of CD4 cell counts

From: Factors related to baseline CD4 cell counts in HIV/AIDS patients: comparison of poisson, generalized poisson and negative binomial regression models

Variable Coefficient Standard Error Z Score P_value 95% Conf. Interval
Intercept 7.08 0.02 71.69  < 0.001 (6.88, 7.30)
Age
 < 30 Reference     
 30–40 − 0.26 0.03 − 8.44  < 0.001 (− 0.32, − 0.20)
 40–50 − 0.34 0.04 − 8.74  < 0.001 (− 0.42, − 0.27)
  > 50 − 0.36 0.06 − 6.59  < 0.001 (− 0.47, − 0.26)
Sex
 Female Reference     
 Male − 0.11 0.04 − 2.98 0.003 (− 0.18, − 0.04)
Marital status
 Single Reference     
 Married 0.01 0.03 0.28 0.78 (− 0.06, 0.07)
 Divorced 0.02 0.04 0.54 0.587 (− 0.06, 0.11)
 Window − 0.18 0.11 − 1.71 0.086 (− 0.39, 0.03)
 Unknown − 0.18 0.11 − 1.71 0.086 (− 0.39, 0.03)
Education
 Illiterate Reference     
 Primary School 0.01 0.05 0.13 0.898 (− 0.10, 0.11)
 Secondary School 0.05 0.05 0.84 0.404 (− 0.06, 0.15)
 High School 0.04 0.06 0.71 0.476 (− 0.07, 0.15)
 Academic − 0.01 0.07 − 0.12 0.90 (− 0.15, 0.13)
 Unknown − 0.06 0.06 − 0.95 0.34 (− 0.17, 0.06)
Job
 Employed Reference     
 Unemployed − 0.01 0.03 − 0.28 0.78 (− 0.07, − 0.28)
 Unknown − 0.02 0.03 − 0.57 0.569 (− 0.08, 0.05)
Transmission
 Mother to child Reference     
 Inject Drug User − 0.45 0.09 − 5.21  < 0.001 (− 0.62, − 0.28)
 Unsafe Sex − 0.43 0.09 − 4.95  < 0.001 (− 0.59, − 0.26)
 Blood Transfusion and Unknown − 0.57 0.09 − 6.27  < 0.001 (− 0.75,−  0.39)
Year of HIV diagnosis
 Before 2006 Reference     
 2006–2011 − 0.42 0.04 − 9.50  < 0.001 (− 0.51, − 0.34)
 After 2011 − 0.39 0.04 − 8.67  < 0.001 (− 0.47, − 0.30)
WHO Clinical Stage
 Stage 1 Reference     
 Stage 2 − 0.24 0.04 − 6.01  < 0.001 (− 0.31, − 0.16)
 Stage 3 − 0.84 0.04 − 20.03  < 0.001 (− 0.93, − 0.76)
 Stage 4 − 0.98 0.05 − 20.32  < 0.001 (− 1.08, − 0.89)
 Unknown − 0.19 0.04 − 5.23  < 0.001 (− 0.26, − 0.12)
TB co-infection
 No Reference     
 Yes − 0.12 0.06 − 2.03 0.042 (− 0.01, − 0.23)
 r 0.68 0.01    (0.66, 0.71)
  1. Likelihood-ratio test of r = 0: chibar2 (01) = 7.5e + 05 Prob ≥chibar2 = 0.000