Table 5 Complete case analysis for variables used in the final modelb
Variables | Complete Case (n = 10,210)b | |||||
|---|---|---|---|---|---|---|
Univariablea | Multivariable | |||||
RR | 95% LCI | 95% UCI | RR | 95% LCI | 95% UCI | |
Household Income Quintiles | ||||||
 First (refer: highest) | Ref | – | – | Ref | – | – |
 Second | 1.12 | 0.99 | 1.25 | 1.08 | 0.96 | 1.22 |
 Third | 1.19 | 1.7 | 1.33 | 1.11 | 0.98 | 1.26 |
 Fourth | 1.22 | 1.08 | 1.38 | 1.09 | 0.95 | 1.26 |
 Fifth (Lowest) | 1.28 | 1.13 | 1.44 | 1.15 | 0.996 | 1.34 |
Baseline Risk Factors | ||||||
 Child’s sex (Ref: female) | 1.23 | 1.14 | 1.33 | 1.22 | 1.13 | 1.32 |
 Child ethnic group (Ref: White) | 0.78 | 0.68 | 0.9 | 0.79 | 0.68 | 0.91 |
Maternal age at MCS birth | ||||||
 35+ years | Ref | – | – | Ref | – | – |
 25–34 years | 1.07 | 0.92 | 1.24 | 1.07 | 0.92 | 1.25 |
 20–24 years | 0.92 | 0.82 | 1.05 | 0.95 | 0.82 | 1.11 |
 14–19 years | 0.76 | 0.54 | 1.06 | 0.77 | 0.55 | 1.09 |
Number of children in the household at birth (including MCS child) | ||||||
 MCS lone child | Ref | – | – | Ref | – | – |
 2/3 children | 1.11 | 1.02 | 1.2 | 1.1 | 1.01 | 1.2 |
 4 or more children | 1.25 | 1.08 | 1.43 | 1.22 | 1.04 | 1.44 |
Factors That May Influence Environmental Safety | ||||||
 Safe areas to play at home at 9 months (Ref: No safe areas) | 1.06 | 0.98 | 1.14 | 1 | 0.92 | 1.08 |
Items of named safety equipment used at 9 months | ||||||
 None | Ref | – | – | Ref | – | – |
 1 piece | 1.11 | 0.76 | 1.61 | 1.15 | 0.79 | 1.66 |
 2 pieces | 1.18 | 0.84 | 1.66 | 1.25 | 0.9 | 1.74 |
 3 pieces | 1.28 | 0.92 | 1.79 | 1.36 | 0.98 | 1.89 |
 4 pieces | 1.28 | 0.91 | 1.79 | 1.36 | 0.98 | 1.9 |
 5 pieces | 1.27 | 0.90 | 1.8 | 1.36 | 0.97 | 1.92 |
 Access to a garden at 9 months (Ref: No access) | – | – | – | – | – | – |
Type of childcare used at 3 yrs. old | ||||||
 None (parents look after child) | Ref | – | – | Ref | – | – |
 Registered childcare provider | 0.94 | 0.85 | 1.04 | 0.99 | 0.89 | 1.1 |
 Non-registered childcare provider (e.g. family, friends) | 0.91 | 0.81 | 1.02 | 1.03 | 0.91 | 1.17 |
 Household pets at 3 yrs. old (ref: No pets) | 1.09 | 1.02 | 1.17 | 1.04 | 0.97 | 1.12 |
 Household smoking at 3 yrs. old (ref: None) | 1.14 | 1.03 | 1.26 | 1.01 | 0.9 | 1.13 |
 Poor home safety (HOME score) at 3 yrs. old | – | – | – | – | – | – |
 Responder feels unsafe in area at 3 yrs. old | 1.17 | 1.06 | 1.29 | 1.08 | 0.98 | 1.19 |
Disorganised home environment at age 3 years | ||||||
 Very organised | Ref | – | – | Ref | – | – |
 Organised | 1.08 | 0.98 | 1.19 | 1.05 | 0.95 | 1.15 |
 Average | 1.19 | 1.05 | 1.36 | 1.11 | 0.98 | 1.27 |
 Disorganised | 1.18 | 1.03 | 1.35 | 1.06 | 0.92 | 1.22 |
 Very disorganised | 1.55 | 1.25 | 1.93 | 1.35 | 1.09 | 1.67 |
Factors That May Influence Supervision | ||||||
 Maternal distress measured MCSc age 3 (Ref: Kessler < 5) | 1.36 | 1.09 | 1.68 | 1.18 | 0.94 | 1.47 |
 Limiting long term condition MCSc age 3 (Ref: none) | 1.12 | 1.02 | 1.24 | 1.08 | 0.98 | 1.19 |
Alcohol units per week MCSc age 3 | ||||||
 None | – | – | – | – | – | – |
 1–6 units | – | – | – | – | – | – |
 7–14 units | – | – | – | – | – | – |
 15 or more unitsc | – | – | – | – | – | – |
 Approach to parenting MCSc age 3 (Ref: Unstructured) | – | – | – | – | – | – |
Family and friends live nearby, MCSc age 3 (Ref: both) | ||||||
 Both | – | – | – | – | – | – |
 Family only | – | – | – | – | – | – |
 Friends only | – | – | – | – | – | – |
 Neither nearby | – | – | – | – | – | – |
Factors Relating To The Mcs Child’s Abilities And Behaviours | ||||||
 Strength and Difficulties Questionnaire (SDQ), MCSc age 3 | ||||||
  Average | Ref | – | – | Ref | – | – |
  Borderline | 1.12 | 0.99 | 1.26 | 1.05 | 0.93 | 1.19 |
  Below average | 1.3 | 1.16 | 1.46 | 1.16 | 1.03 | 1.32 |
  Sight concerns, MCSc age 3 | – | – | – | – | – | – |
  Hearing concerns, MCSc age 3 | – | – | – | – | – | – |
  Child is NOT school ready, MCSc age 3 | 0.85 | 0.76 | 0.94 | 1.06 | 0.96 | 1.18 |