Table 2 Operational Definitions Table

Sociodemographic of respondent

This refers to the sociodemographic of respondent’s which include: maternal age, marital status, no children, maternal educational status, paternal educational status, maternal occupation, religion, ethnicity, monthly income and place of resident.

1.

Maternal age

This refers to the age of mother at the time of delivery which is been categorized into two different groups; below 20 or above 20 years of age (Negussie, Kassahun, Assegid & Hagan, 2015) [23].

2.

Marital status

This refers to the respondent’s official marital status which is been categorized into five different groups single, married, divorced or widowed (Anokye et al., 2018) [24].

3.

No of children

This refers to the numbers of children having per mother (Oliveira, Martinez & Rocha, 2014) [25].

4.

Maternal educational status

This refers to educational status of mother which could be no-formal education, primary school education, secondary school education or tertiary education (Kiptoo, Esilaba, Kobia & Ngure, 2015) [26].

5.

Paternal educational status

This refers to educational status of father which could be no-formal education, primary school education, secondary school education or tertiary education (Legesse & Dechasa, 2015) [16].

6.

Maternal occupation

This refers to occupational status of mothers and it is been classified into four categories; house wife, student, trader, civil servant or farmer (Legesse & Dechasa, 2015) [16].

7.

Religion

The respondent’s religion status for this study is categorized into Muslim and non-Muslim.

8.

Ethnicity

The respondent’s ethnicity for this study is categorized into Hausa and non-Hausa

9.

Monthly income

This refers to the amount of income a family earn in a month and in this study, it is categorized into less than 18,000 or above 18,000 naira (Nigerian currency).

10.

Place of resident

Area of residence was described as a place where people are living which could either be a rural or urban area (Kiptoo, 2015) [26].

Obstetric history of respondent

This refers to the number of times attended ANC follow-up (Legesse & Dechasa, 2015) [16], birth interval between last born and current pregnancy (Rahman & Obaida-Nasrin, 2010) [21] and whether or not mothers receive any Tetanus toxoid vaccine (Adedire et al., 2016) [27]. In this study, number of times attended ANC follow-up is categorized into either less than three times or more-than three times. Birth interval between last born and current pregnancy was classified into three categories: first pregnancy, less than 48 months or more than 48 months. For whether or not mothers receive any Tetanus toxoid vaccine, it was classified as either yes or no.

Health care system of respondent

This refers to health care infrastructure or resourcing which includes: distance to health facility (Legesse & Dechasa, 2015) [16], attitude of the hospital staff (Chambongo, Nguku, Wasswa & Semali, 2016) [28], accessibility of vaccine site (Animaw et al., 2014) and mode of transportation to reach hospital (Odutola et al., 2015) [29]. In this study, distance to health facility is classified into either less than 30 min or more than 30 min, attitude of hospital staff could either be good or poor, hospital accessibility either yes or no and means of transportation to hospital either car/motorcycle or walking.

Maternal knowledge

This refers to the knowledge of mother’s regarding general knowledge on childhood immunization, knowledge on child immunization schedule, knowledge on vaccine side effects and management and knowledge on sign, symptoms and mode of transmission of VPDs.

Maternal attitudes

This refers to the attitudes of mother’s towards childhood immunization uptake.

Maternal outcome expectation

Maternal self-efficacy

Environmental factors

This refers to the outcome expectation of mother’s towards childhood immunization uptake (important of vaccinating a child and consequences that may arise for non-compliance).

This refers to the self-efficacy of mother’s towards childhood immunization uptake.

This refers to factors other than cognitive including cultural beliefs, religious beliefs and health care system.

Cultural beliefs

This refers to the cultural beliefs of respondent’s towards childhood immunization uptake.

Religious beliefs

This refers to the beliefs on religious regulations of respondent’s towards childhood immunization uptake.