Table 2. Controls for relationship between number of vaccine doses and infant mortality rates in our original study (n = 30).

IMR: infant mortality rate.

Control variable (number of nations providing data)	Correlation between control variable and vaccine doses	Correlation between control variable and IMR	Partial correlation between vaccine doses and IMR controlling for control variable(s)
Child poverty rate (28)	.41 (p < .03)	.46 (p < .02)	.68 (p < .001)
Low birth weight (28)	.26	.25	.72 (p < .001)
Pertussis vaccination rate (24)	−.56 (p < .005)	−.56 (p < .006)	.64 (p < .002)
Breast feeding ever % (22)	−.50 (p < .02)	−.37 (p < .10)	.73 (p < .001)
Teenage fertility rate (28)	.44 (p < .02)	.48 (p < .01)	.67 (p < .001)
Births out of wedlock (27)	−.13	−.21	.73 (p < .001)
Average age at first marriage (22)	−.46 (p < .04)	−.36 (p < .11)	.62 (p < .004)
No children when divorced % (21)	−.17	.12	.70 (p < .002)
Total fertility rate (27)	.11	.08	.74 (p < .001)
Pertussis incidence (24)	−.13	.05	.75 (p < .001)
Mother's index (29)	.13	.24	.74 (p < .001)