Variables | Total sample (n = 14,355)a | FINAL MODEL COMPLETE CASE (n = 10,210)b | |||||
---|---|---|---|---|---|---|---|
Univariable | Multivariable | ||||||
Risk ratio (RR) | 95% LCI | 95% UCI | P-value | RR | 95% LCI | 95% UCI | |
Household Income Quintiles | |||||||
 First (refer: highest) | Ref | – | – | < 0.001 | Ref | – | – |
 Second | 1.12 | 0.99 | 1.25 | 1.08 | 0.96 | 1.22 | |
 Third | 1.19 | 1.06 | 1.33 | 1.11 | 0.98 | 1.26 | |
 Fourth | 1.22 | 1.07 | 1.38 | 1.09 | 0.95 | 1.26 | |
 Fifth (Lowest) | 1.27 | 1.13 | 1.43 | 1.15 | 0.996 | 1.34 | |
Baseline Risk Factors | |||||||
 Child’s sex (Ref: female) | 1.22 | 1.14 | 1.31 | < 0.001 | 1.22 | 1.13 | 1.32 |
 Child ethnic group (Ref: White) | 0.74 | 0.66 | 0.82 | < 0.001 | 0.79 | 0.68 | 0.91 |
Maternal age at MCS birth | |||||||
 35+ years | Ref | – | – | < 0.001 | Ref | – | – |
 25–34 years | 0.69 | 0.5 | 0.93 | 1.07 | 0.92 | 1.25 | |
 20–24 years | 0.84 | 0.76 | 0.93 | 0.95 | 0.82 | 1.11 | |
 14–19 years | 0.99 | 0.88 | 1.11 | 0.77 | 0.55 | 1.09 | |
Number of children in the household at birth (including MCS child) | |||||||
 MCS lone child | Ref | – | – | 0.01 | Ref | – | – |
 2/3 children | 1.1 | 1.03 | 1.17 | 1.10 | 1.01 | 1.20 | |
 4 or more children | 1.11 | 0.99 | 1.25 | 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 | 0.99 | 1.12 | 0.08 | 1.00 | 0.92 | 1.08 |
Items of named safety equipment used at 9 months | |||||||
 None | Ref | – | – | 0.04 | Ref | – | – |
 1 piece | 1.13 | 0.87 | 1.47 | 1.15 | 0.79 | 1.66 | |
 2 pieces | 1.28 | 1.01 | 1.63 | 1.25 | 0.9 | 1.74 | |
 3 pieces | 1.32 | 1.04 | 1.67 | 1.36 | 0.98 | 1.89 | |
 4 pieces | 1.34 | 1.06 | 1.7 | 1.36 | 0.98 | 1.90 | |
 5 pieces | 1.33 | 1.04 | 1.71 | 1.36 | 0.97 | 1.92 | |
 Access to a garden at 9 months (Ref: No access) | 1.05 | 0.91 | 1.21 | 0.49 | – | – | – |
Type of childcare used MCSc age 3 | |||||||
 None (parents look after child) | Ref | – | – | 0.09 | Ref | – | – |
 Registered childcare provider | 0.91 | 0.83 | 1 | 0.99 | 0.89 | 1.10 | |
 Non-registered childcare provider (e.g. family, friends) | 0.94 | 0.85 | 1.04 | 1.03 | 0.91 | 1.17 | |
 Household pets MCSc age 3 (ref: No pets) | 1.14 | 1.07 | 1.21 | < 0.001 | 1.04 | 0.97 | 1.12 |
 Household smoking MCSc age 3 (ref: None) | 1.15 | 1.05 | 1.26 | < 0.001 | 1.01 | 0.90 | 1.13 |
 Poor home safety (HOME score) MCSc age 3 | 1.20 | 0.93 | 1.55 | 0.17 | – | – | – |
 Responder feels unsafe in area MCSc age 3 | 1.12 | 1.03 | 1.22 | 0.01 | 1.08 | 0.98 | 1.19 |
Disorganised home environment MCSc age 3 | |||||||
 Very organised | Ref | – | – | < 0.001 | Ref | – | – |
 Organised | 1.09 | 1 | 1.18 | 1.05 | 0.95 | 1.15 | |
 Average | 1.15 | 1.02 | 1.29 | 1.11 | 0.98 | 1.27 | |
Disorganised | 1.16 | 1.02 | 1.31 | 1.06 | 0.92 | 1.22 | |
Very disorganised | 1.61 | 1.32 | 1.95 | 1.35 | 1.09 | 1.67 | |
Factors That May Influence Supervision | |||||||
Maternal distress at 3 yrs. (Ref: Kessler < 5) | 1.33 | 1.12 | 1.59 | 0.01 | 1.18 | 0.94 | 1.47 |
Limiting long term condition MCSc age 3 (Ref: none) | 1.16 | 1.07 | 1.26 | < 0.001 | 1.08 | 0.98 | 1.19 |
Alcohol units per week (MCSc age 3) | |||||||
None | Ref | – | – | 0.58 | – | – | – |
1–6 units | 0.98 | 0.92 | 1.05 | – | – | – | |
7–14 units | 1.04 | 0.93 | 1.16 | – | – | – | |
15 or more units+ | 1.1 | 0.92 | 1.32 | – | – | – | |
Approach to parenting MCSc age 3 (Ref: Unstructured) | 1 | 0.93 | 1.06 | 0.71 | – | – | – |
Family and friends live nearby, MCSc age 3 (Ref: both) | |||||||
Both | Ref | – | – | 0.19 | – | – | – |
Family only | 1.06 | 0.95 | 1.17 | – | – | – | |
Friends only | 0.95 | 0.89 | 1.02 | – | – | – | |
Neither nearby | 1.00 | 0.91 | 1.11 | – | – | – | |
Factors Relating To The Mcs Child’s Abilities And Behaviours | |||||||
Strength and Difficulties Questionnaire (SDQ), MCSc age 3 | |||||||
Average | Ref | – | – | < 0.001 | Ref | – | – |
Borderline | 0.06 | 1.03 | 1.26 | 1.05 | 0.93 | 1.19 | |
Below average | 1.32 | 1.19 | 1.46 | 1.16 | 1.03 | 1.32 | |
Sight concerns, MCSc age 3 | 1.02 | 0.9 | 1.15 | 0.75 | – | – | – |
Hearing concerns, MCSc age 3 | 1.08 | 0.95 | 1.23 | 0.24 | – | – | – |
Child is NOT school ready, MCSc age 3 | 0.91 | 0.82 | 1.00 | 0.06 | 1.06 | 0.96 | 1.18 |