Table 5 Nodes (psychological variables) based on items in the survey, including item examples, number of items per node and reliability of nodes as observed in the current study (calculated with every respondent completing the survey in either of the six waves).

From: Understanding change in COVID-19 vaccination intention with network analysis of longitudinal data from Dutch adults

Node

Items per node, reliability

Examples of items per node (/in the same text line means separate item in survey)

Intention vaccine

1

I am getting vaccinated against COVID-19

Vaccines attitude

11, a = 0.95

I have a good feeling about COVID-19 vaccines/People who do not want to get vaccinated against COVID-19 make me angry/COVID-19 vaccines protect well against COVID-19/The side effects of COVID-19 vaccines have been sufficiently studied

Vaccines negative affect

3, a = 0.88

I worry about the safety of COVID-19 vaccines/I feel misled about the safety of COVID-19 vaccines

Vaccines involvement

3, a = 0.75

I follow the news about COVID-19 vaccines/I know much about COVID-19 vaccines

Vaccines social norm

2, rsb = 0.90

I think my family and friends get vaccinated against COVID-19/I think everyone should get vaccinated against COVID-19

Vaccines trust

2, rsb = 0.94

I trust the science behind COVID-19 vaccines/I trust the developers of COVID-19 vaccines

General attitude vaccination

1

I am in favor of using vaccinations to prevent disease

Pandemic negative affect and cognitions

6, a = 0.83

I am afraid of getting infected with the coronavirus/I worry about losing friends or family to COVID-19/COVID-19 is dangerous to my health

Pandemic trust authorities

1

I trust the authorities responsible for fighting the COVID-19 pandemic

Preventive behaviors

3, a = 0.74

I keep 1.5 meters away from others as much as possible/I wear a face mask in public areas

  1. All items were answered on a scale ranging from 1 (Strongly disagree) to 7 (Strongly agree). Mean scores of items were calculated for nodes based on more than one item.