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Table 1 Description and response options for variables included in analyses

From: Maternal drinking and smoking. Can it explain the exceptional academic performance of LBOTE children? A preliminary analysis

Variable

Description

Response options and values

Homework frequency (Wave 4)

How often does study child do homework?

1: Daily

2: A few times a week

3: Once a week

4: A few times a month

5: Once a month

6: Less than once a month

7: Never

Homework help (Wave 4)

During this school year, how often have you or another family member (or adult in the household) helped study child with his/her homework?

1: Daily

2: A few times a week

3: Once a week

4: A few times a month

5: Less often

Tutoring (Wave 4)

In the last 12 months has the study child received any additional help or tutoring from anyone outside the household?

1: Yes

2: No

(− 2: Don’t know-coded as missing data)

Tutoring frequency (Wave 4)

How often?

1: More than once a week

2: Once a week

3: Less than once a week

(− 2: Don’t know-coded as missing data)

Homework hours (Wave 5)

In an average week, how many hours does study child spend on homework outside of school?

Number of hours

Homework help (Wave 5)

During this school year, how often did someone in this household help study child with homework?

1: 5 or more days a week

2: 3 or 4 days a week

3: 1 or 2 days a week

4: Less than once a week

5: Never

Tutoring (Wave 5)

In the last 12 months has study child received any additional help or tutoring from anyone outside the household?

1: Yes

2: No

(− 2: Don’t know-coded as missing data)

Tutoring frequency (Wave 5)

How often?

1: More than once a week

2: Once a week

3: Less than once a week

(− 2: Don’t know-coded as missing data)

Homework hours (Wave 6)

In an average week, how many hours does study child spend on homework outside of school?

Number of hours

Homework help (Wave 6)

During this school year, how often did someone in this household help study child with his/her homework?

1: 5 or more days a week

2: 3 or 4 days a week

3: 1 or 2 days a week

4: Less than once a week

5: Never

Tutoring (Wave 6)

In the last 12 months has study child received any additional help or tutoring from anyone outside the household?

1: Yes

2: No

(− 2: Don’t know-coded as missing data)

Tutoring frequency (Wave 6)

How often?

1: More than once a week

2: Once a week

3: Less than once a week

(− 2: Don’t know-coded as missing data)