Table 1 Definition and measurement coding of independent variables

Age

In what month and year were you born?

1 = 17–19

2 = 15–16

Note: The individual ages in the dataset were categorized into 17–19 and 15–16

Wealth index

Wealth index (quintiles) was calculated by DHS from responses on household asset ownership using Principal Component Analysis.

1 = poorest quintile

2 = poorer quintile

3 = middle quintile

4 = richer quintile

5 = richest quintile

Residence

-

1 = Urban

2 = Rural

Region

-

1 = Eastern

2 = Northern

3 = Northwestern

4 = Southern

5 = Western

What is the highest level of school you attended: primary, secondary or higher?

1 = no education

2 = primary education

3 = post-primary education

Higher level of education as shown in Table 2 had only 14 adolescents so in the logistic regression analysis, we combined secondary and tertiary into post-primary

Household size

How many people usually live in your household?

1 = less than seven members 2 = seven and above members

Note: The categorization was based on the dataset’s average household size

Sex of household head

Is the head of this household male or female?

1 = Female

2 = Male

Working status

What is your occupation? That is, what kind of work do you mainly do?

1 = Yes Working

2 = Not working

Marital status

Are you currently married or living with a man as if married?

1 = Married

2 = Not married

Married including those in formal and informal unions

Religion

What is your religion?

1 = Christianity

2 = Islam

Note: The dataset had 6 categories; Christianity, Islam, Bahai, Traditional, None and Others. However, all study participants belonged to either Christianity or Islam

Problems seeking permission to get healthcare

Many different factors can prevent women from getting medical advice or treatment for themselves. When you are sick and want to get medical advice or treatment, is each of the following a big problem or not a big problem:

a) Getting permission to go to the doctor?

1 = No big problem

2 = big problem

Problems with distance to health facility

Many different factors can prevent women from getting medical advice or treatment for themselves. When you are sick and want to get medical advice or treatment, is each of the following a big problem or not a big problem:

b) The distance to the health facility?

1 = No big problem

2 = big problem

Exposure to family planning messages on mass media

In the last few months have you:

a) Heard about family planning on the radio?

b) Seen anything about family planning on the television?

c) Read about family planning in a newspaper or magazine?

d) Received a voice or text message about family planning on a mobile phone?

1 = Yes (if exposed to any on television, radio, mobile phone and newspapers).

2 = No (No exposure to any of the 4)