Table 5 Bivariable and Multivariable analysis on determinants of the defaulter to full vaccination among Children Aged 12–23 Months in Siraro District, West Arsi Zone, Ethiopia 2022 (n = 437)

Knowledge about child vaccination

Inadequate knowledge

4.20 (0.2.75, 6.43)*

4.32 (2.79, 6.70)

< 0.001**

Adequate knowledge

1

1

Educational status of Mothers/caretakers

Unable to read and write

1.57 (0.85, 2.89)*

1.01 (0.44, 2.33)

0.97

Primary (1–8)

0.79 (0.39, 1.61)

0.60 (0.25, 1.43)

0.25

Secondary (9–12) and above

1

1

Educational status of Fathers

Unable to read and write

2.72 (1.38, 5.37)*

3.66 (1.29, 10.39)

0.02**

Primary (1–8)

1.88 (0.91, 3.91)

2.42 (0.88, 6.61)

0.85

Secondary (9–12) and above

1

1

Average monthly income (ETB)

≤ 1000

1.59 (0.89, 2.86) *

1.20 (0.48, 3.03)

0.69

1001–2000

1.86 (0.94, 3.68)

1.42 (0.56, 3.61)

0.45

2001–3000

2.75 (1.15, 6.62)

1.43 (0.73, 2.74)

0.13

≥ 3001

1

1

Time to reach health facility (in walk time)

Less than or equal to 30 min

1

1

Greater than 30 min

2.49 (1.65, 3.76)*

2.45 (1.51, 3.97)

< 0.001**

Health workers told type of vaccine received

Yes

1

1

No

4.04 (2.61, 6.25)*

2.37 (1.27, 4.45)

0.01**

Information about next vaccine schedule

Yes

1

1

No

5.79 (3.40, 9.87)*

2.28 (0.94, 5.55)

0.71

Parents’ discussion on child immunization

Yes

1

1

No

3.25 (2.14, 4.93)*

2.16 (1.24, 3.79)

0.01**

Immunization Service Satisfaction

Not satisfied

1.44 (0.89, 2.36)*

1.46 (0.87, 2.44)

0.152

Satisfied

1

1

Attended ANC follow up

Yes

1

1

No

3.69 (2.19, 6.25)*

2.70 (0.95, 2.13)

0.62

Place of delivery

Health facility

1

1

Home

4.21 (2.72, 6.49)*

2.43 (1.39, 4.25)

0.002**

Attended PNC follow up

Yes

1

1

No

3.48 (2.28, 5.32)*

1.64 (0.95, 2.81)

0.074

Participation in pregnant mother conference

Yes

1

1

No

4.12 (1.44, 3.26)*

2.47 (1.35, 4.49)

0.003**

Attended model family training

Yes

1

1

No

2.76 (1.76, 4.33)*

1.16 (0.58, 2.33)

0.63