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Table 5 Complete case analysis for variables used in the final modelb

From: Understanding pathways to social inequalities in childhood unintentional injuries: findings from the UK millennium cohort study

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
  1. awhen P < 0.1 (if rounded 1 d.p.) variables were included in the complete case, multivariable analysis
  2. b Using sample comprising complete cases for all variables in final multivariable analysis
  3. c 15 or more units is in excess of UK Guidance for all adults