*2.5. Variables*

The construction of variables related to vaccination was based on definitions supported by Brazil's National Immunization Program recommendations and the World Health Organization [4,17].

Vaccines recommended and distributed free of charge by the Brazilian government for children under one year: BCG (single dose), Hepatitis B (4 doses), Rotavirus (2 doses), pentavalent DTP/Hib/Hepatitis B (3 doses), Polio (3 doses), PCV10 (2 doses), MenC (2 doses), and YF (single dose), offering protection against more than 11 diseases [17].

Doses: We considered the recommended doses according to the national child vaccination schedule for the first year, without considering the interval between doses. For multiple-dose vaccines, the record of the last dose was considered [17].

Complete basic vaccination schedule: Defined as the doses of vaccines recommended for the first year established by the basic vaccination schedule in force and applied up to 11 months and 29 days, including one dose of BCG vaccine (Bacillus Calmette-Guérin), the last dose of Hepatitis B vaccine, the last dose of Diphtheria-Tetanus-Pertussis vaccine (DTP), the last dose of Hemophilus influenzae type b vaccine (Hib), the last dose of Poliovirus vaccine (Polio), the last dose of 10-valent pneumococcal vaccine, the last dose of Rotavirus vaccine, the last dose of Serogroup C meningococcal conjugate vaccine, and one dose of Yellow Fever vaccine [17].

Incomplete basic vaccination schedule: Not receiving at least one of the doses described in the complete basic vaccination schedule.

Table 1 presents the changes made to the National Vaccination Calendars of the National Immunization Program in Brazil of the vaccines recommended for the first year between 2015 and 2017.

**Table 1.** Changes made to the National Vaccination Calendars of the National Immunization Program in Brazil of vaccines recommended for the first year between 2015 and 2017.


BCG: Bacillus Calmette-Guérin vaccine; DTP: Diphtheria-Tetanus-Pertussis vaccine; Hib: *Haemophilus influenzae* type b vaccine; Polio: Poliovirus vaccine (inactivated Polio vaccine (IPV))/oral Polio vaccine (OPV)); PCV10: 10-valent pneumococcal vaccine; MenC: Serogroup C meningococcal conjugate vaccine; YF: Yellow Fever vaccine. Source: Ordinances and technical reports of the National Immunization Program [18–22]. Note: In this study, the recommended vaccine doses up to 11 months and 29 days were included; therefore, the first dose of the measles-mumps-rubella (MMR) vaccine and the booster of the PCV10 vaccine were not considered.

General vaccine coverage: Vaccination coverage (VC) was calculated according to the applied doses and was defined as the percentage of children with a complete basic vaccination schedule, namely:

VC <sup>=</sup> number of children with vaccination records and complete basic vaccination schedule total number of children with vaccination records <sup>×</sup> <sup>100</sup>

> The dependent variable in this study was incomplete general vaccination coverage related to the vaccination situation (yes or no) according to the applied doses described in the basic vaccination schedule, evaluated at 11 months and 29 days.

> The independent variables included the sex of the child (male or female), the type of community (settlement or quilombola), housing zone (rural or urban/periurban), mesoregion of Goiás (Central Goiano, East Goiano, Northwest Goiano, North Goiano, or South Goiano), mother's age (≤28 or ≥29 years), number of people in the house (≤5 or ≥6), internet access (yes or no), income (≤USD 277.91 or ≥ USD 277.92), health professional visit in the last year (yes or no), and community healthcare unit availability (yes or no). Quantitative variables, such as the mother's age, number of people in the house, and income, were categorized based on their mean (less than or equal to the mean versus greater than or equal to the mean).
