Table 5 Variable description and summary statistics
Variable | Description | Mean | Min | Max | SD |
|---|---|---|---|---|---|
Male | Dummy = 1 if male, = 0 if female | 0.51 | 0.00 | 1.00 | 0.50 |
Child age | Child age (months) | 106.59 | 75.00 | 140.00 | 19.51 |
Native | Dummy: = if child was born in Australia, = 0 otherwise | 0.96 | 0.00 | 1.00 | 0.18 |
Aboriginal | Dummy: = 1 if child has Aboriginal/Torres Strait Islander origin, = 0 otherwise | 0.02 | 0.00 | 1.00 | 0.15 |
Low birth weight | Dummy: = 1 if child’s birth weight is 2500 g or less, = 0 otherwise | 0.07 | 0.00 | 1.00 | 0.25 |
Breastfeed | Dummy: = 1 if child was breastfed at 3 or 6 month, = 0 otherwise | 0.74 | 0.00 | 1.00 | 0.44 |
Mother age | Mother age (years) | 39.07 | 18.00 | 69.00 | 5.24 |
Mother NESBa | Dummy: = 1 if mother was born in a Non-English Speaking Background (NESB) country, = 0 otherwise | 0.20 | 0.00 | 1.00 | 0.40 |
Mother ESBa | Dummy: = 1 if mother was born in an English Speaking Background (ESB) country, = 0 otherwise | 0.15 | 0.00 | 1.00 | 0.36 |
Mother has a certificateb | Dummy: = 1 if other has a certificate, = 0 otherwise | 0.30 | 0.00 | 1.00 | 0.46 |
Mother has an advanced diplomab | Dummy: = 1 if mother has advanced diploma/diploma, = 0 otherwise | 0.10 | 0.00 | 1.00 | 0.30 |
Mother has bachelor degreeb | Dummy: = 1 if mother has a bachelor degree, = 0 otherwise | 0.17 | 0.00 | 1.00 | 0.38 |
Mother has graduate diplomab | Dummy: = 1 if mother has graduate diploma/certificate, = 0 otherwise | 0.08 | 0.00 | 1.00 | 0.27 |
Mother has postgraduate degreeb | Dummy: = 1 if mother has a postgraduate degree, = 0 otherwise | 0.08 | 0.00 | 1.00 | 0.26 |
Mother’s weekly working hours | Mother’s average weekly working hours (hours) | 19.76 | 0.00 | 120.00 | 16.44 |
Home environment index | A scale between 0 and 3 describing the frequency of activities the family do together at home such as reading, games, or drawing pictures. | 1.36 | 0.00 | 3.00 | 0.60 |
Out-of-home activity index | The number of “yes” answers to questions about activities that the family do together, such as going to a movie, sporting event, library, or religious service | 2.63 | 0.00 | 5.00 | 1.21 |
Having a computer at home | Dummy: = 1 if having a computer at home, = 0 otherwise | 0.94 | 0.00 | 1.00 | 0.24 |
Catholic schoolc | Dummy: = 1 if child attends a Catholic school, = 0 otherwise | 0.22 | 0.00 | 1.00 | 0.42 |
Other independent schoolc | Dummy: = 1 if child attends an Independent school, = 0 otherwise | 0.13 | 0.00 | 1.00 | 0.33 |
Household size | Household size | 4.59 | 2.00 | 13.00 | 1.15 |
Number of siblings | Number of siblings | 1.61 | 0.00 | 9.00 | 1.02 |
Number of younger siblings | Number of younger siblings | 0.77 | 0.00 | 6.00 | 0.85 |
Number of same age siblings | Number of same age siblings | 0.03 | 0.00 | 2.00 | 0.18 |
Living with both parents | Dummy: = 1 if child lives with both parents, = 0 otherwise | 0.82 | 0.00 | 1.00 | 0.38 |
Living in an owned home | Dummy: = 1 if child attends a Catholic school, = 0 otherwise | 0.78 | 0.00 | 1.00 | 0.42 |
Household income | Yearly household income (AUD 1000) | 92.04 | 1.69 | 2792.92 | 75.72 |