Table 1 Definitions of outcome measures, ethnicity variables and covariates
Variable | Data collection wave | Definition | Proportion/mean | N | |
|---|---|---|---|---|---|
Outcome measures | |||||
Immunisation | Antenatal intention to fully immunise | DCW0 | Dummy variable: 1 if intended to have child fully immunised; 0 otherwise | 0.81 | 6171 |
Self-reported immunisation | DCW1 | Dummy variable: 1 if mother reported that the 6-week, 3-month and 5-month immunisations were all given; 0 otherwise | 0.84 | 6846 | |
All first-year immunisations | DCW1 | NIR-validated dummy variable: 1 if the 6-week, 3-month and 5-month immunisations were all given; 0 otherwise | 0.88 | 6668 | |
All first-year immunisations on time1 | DCW1 | NIR-validated dummy variable: 1 if the 6-week, 3-month and 5-month immunisations were all given on time; 0 otherwise | 0.70 | 6668 | |
Received 15-month immunisations | DCW2 | Dummy variable: 1 if mothers reported that child received their 15-month immunisation (partial or full); 0 otherwise | 0.94 | 6312 | |
Received age 4 immunisations | DCW4 | Dummy variable: 1 if mother reported that child received their age 4 immunisations (partial or full); 0 otherwise | 0.87 | 5951 | |
Primary care | Choice of LMC2 (antenatal) | DCW0 | Dummy variable: 1 if type of LMC was first choice; 0 otherwise | 0.89 | 6645 |
Seen GP or any health professionals since becoming pregnant (antenatal) | DCW0 | Dummy variable: 1 if the mother has seen any family doctor or GP since she became pregnant; 0 otherwise | 0.72 | 6821 | |
Satisfied with usual GP practice (age 9-months) | DCW1 | Dummy variable: 1 if very or completely satisfied with child's usual GP practice; 0 otherwise | 0.68 | 6252 | |
Satisfied with usual GP practice (age 2) | DCW2 | Dummy variable: 1 if very or completely satisfied with child's usual GP practice; 0 otherwise | 0.67 | 5998 | |
Ethnicity and covariates | |||||
Ethnicity | NZ European | DCW0 | Binary indicator for NZ European in self-prioritised ethnicity | 0.550 | 6464 |
Māori | DCW0 | Binary indicator for Māori in self-prioritised ethnicity | 0.133 | 6464 | |
Pacific peoples | DCW0 | Binary indicator for Pacific peoples in self-prioritised ethnicity | 0.136 | 6464 | |
Asian | DCW0 | Binary indicator for Asian in self-prioritised ethnicity | 0.144 | 6464 | |
Other ethnicities | DCW0 | Binary indicator for other ethnicities not defined above | 0.037 | 6464 | |
Mother | First child | DCW0 | Binary indicator for whether child is the first born | 0.420 | 6464 |
Current age (years) | DCW0 – 4 | Continuous measure of mother’s current age (in years) | 30.2 | 6464 | |
Current weight (kg) | DCW0 | Continuous measure of mother’s current weight (in kg) | 80.9 | 5316 | |
Disability status | DCW0 – 4 | Binary indicator for whether mother has a long-term physical disability | 0.057 | 6464 | |
Smokes regularly | DCW0 – 4 | Binary indicator for whether mother smokes regularly | 0.101 | 5840 | |
Child | Girl | DCW1 | Binary indicator for whether child is a girl | 0.484 | 6464 |
Birthweight (grams) | DCW1 | Continuous measure of child’s birthweight (in grams) | 3484.9 | 6460 | |
Child health/developmental problem | DCW1—4 | Binary indicator for whether child has a health/developmental problem | 0.094 | 6458 | |
Child health concern | DCW4 | Binary indicator for whether there is general health concern for the child (e.g. vision, speech, behaviour, mobility etc.) | 0.365 | 5802 | |
Common child illness | DCW4 | Binary indicator for whether child has had at least one common illness (e.g. wheezing, coughing, ear infections etc.) | 0.740 | 5801 | |
Socio-economic | Mother’s employment | DCW0 – 4 | Binary indicator of mother’s employment (equals 1 if employed in a job for wages and salaries; 0 otherwise) | 0.551 | 6464 |
Mother’s post-graduate qualification | DCW0 | Binary indicator for whether mother has a post-graduate qualification (e.g. Honours, Masters, Doctorate) | 0.161 | 6446 | |
Household income < NZ$ 50 K | DCW0 – 4 | Binary indicator for household income less than NZ$ 50,000 | 0.225 | 4979 | |
Household income > = NZ$ 50 K & < = 100 K | DCW0 – 4 | Binary indicator for household income between NZ$ 50,000 and NZ$ 100,000 | 0.401 | 4979 | |
Household | Partner | DCW0 – 4 | Binary indicator for whether mother currently has a partner (equals 1 if mother currently has a partner; 0 otherwise) | 0.856 | 6464 |
NZ born mother | DCW0 | Binary indicator derived from mother’s country of birth (equals 1 if NZ; 0 otherwise) | 0.648 | 6464 | |
Household size | DCW0 | Continuous measure of number of people residing in the same household as mothers | 2.757 | 6441 | |
Number of people > = 18 years | DCW1 | Continuous measure of number of people aged 18 years or over residing in the same household as mother | 1.523 | 6464 | |
Number of people < 18 years | DCW1 | Continuous measure of number of people aged under 18 years residing in the same household as mother | 2.123 | 6461 | |
Number of siblings | DCW2 – 4 | Continuous measure of number of siblings | 1.129 | 6406 | |
Mobility | Mother self-driving | DCW0 – 4 | Binary indicator for mother’s main personal transport (equals 1 if drove private/company car; 0 otherwise) | 0.784 | 5838 |
Numbers of residential moves | DCW0 – 4 | Continuous measure of number of times mother moved in the past 5 years | 2.319 | 6443 | |
Local healthcare | DCW1 | Binary indicator for whether most of household’s healthcare visits are in local areas | 0.744 | 6454 | |
Rural location | DCW0 – 4 | Binary indicator for whether mother lives in a rural area | 0.071 | 6464 | |
Internet access | DCW4 | Binary indicator for whether household has internet access from home | 0.918 | 5804 | |
Social | Discriminated against | DCW0 – 4 | Binary indicator if mother was a victim in the past of ethnically motivated unfair treatment (physical, verbal, and/or by a health professional) | 0.220 | 6464 |
Discouraged to immunise | DCW0 | Binary indicator if during pregnancy mother received any information that discouraged her to immunise child | 0.128 | 6464 | |
Encouraged to immunise | DCW0 | Binary indicator if during pregnancy mother received any information that encouraged her to immunise child | 0.352 | 6464 | |
Childcare services | DCW1 – 4 | Binary indicator if child goes to any childcare services | 0.133 | 6464 | |