Table 2 Multivariable logistic regression model relating drop-out between SPARCLE1 and SPARCLE2 to characteristics recorded in SPARCLE1

n/N

(%)

OR

(95%CI)

p

n/N

(%)

OR

(95%CI)

p

n/N

(%)

OR

(95%CI)

p

n/N

(%)

OR

(95%CI)

p

Child impairment: Walking ability

0.005

I. Walks without limitation

51/225

(22%)

1.0

(0.7 to 1.4)

II. Walks with limitation

15/147

(10%)

0.3

(0.2 to 0.6)

III. Walks with assistive devices

25/126

(20%)

0.8

(0.5 to 1.3)

IV. Unable to walk, limited self-mobility

15/100

(15%)

0.5

(0.3 to 0.9)

V. Unable to walk, severely limited self-mobility

13/112

(12%)

0.4

(0.2 to 0.8)

Child impairment: Feeding

<0.001

By mouth

14/700

(2%)

1.0

-

By tube (partially or completely)

18/54

(33%)

9.1

(4.0 to 21)

Information missing, excluded from analysis

0/1

(0%)

-

-

Child impairment: IQ

<0.001

≥50

4/533

(1%)

1.0

-

<50

28/221

(13%)

9.2

(2.9 to 29)

Information missing, excluded from analysis

0/5

(0%)

-

-

Parental educational qualifications

0.002

0.001

<0.001

Above university entry

5/201

(2%)

0.3

(0.1 to 0.7)

25/190

(13%)

0.6

(0.4 to 0.9)

36/201

(18%)

0.4

(0.3 to 0.7)

Intermediate

28/413

(7%)

1.0

(0.7 to 1.5)

57/359

(16%)

1.0

(0.8 to 1.3)

111/412

(27%)

1.0

(0.8 to 1.2)

None or lowest formal qualifications

18/191

(9%)

1.4

(0.8 to 2.4)

37/161

(23%)

1.9

(1.2 to 3.0)

67/191

(35%)

1.7

(1.2 to 2.4)

Information missing, excluded from analysis

0/6

(0%)

-

-

1/4

(25%)

-

-

3/6

(50%)

-

-

Parental stress

<0.001

<0.001

Below 75th percentile

73/517

(14%)

1.0

(0.7 to 1.3)

138/581

(24%)

1.0

(0.8 to 1.3)

Above 75th percentile

36/166

(22%)

2.2

(1.5 to 3.3)

60/190

(32%)

1.8

(1.3 to 2.5)

Not recorded

10/27

(37%)

4.3

(1.8 to 10.3)

16/33

(48%)

3.6

(1.7 to 7.6)

Family structure

<0.001

Married, living with partner

135/567

(24%)

1.0

(0.8 to 1.2)

Unmarried, living with partner

35/81

(43%)

2.7

(1.7 to 4.3)

Single or separated and living with parents

10/18

(56%)

4.7

(1.7 to 13.0)

Single, living alone

34/138

(25%)

1.1

(0.7 to 1.6)

Information missing, excluded from analysis

0/1

(0%)

-

-

Region

<0.001

<0.001

<0.001

North England

6/114

(5%)

1.0

(0.4 to 2.3)

22/102

(22%)

1.0

(0.6 to 1.7)

34/114

(30%)

1.0

(0.6 to 1.5)

Northern Ireland

3/101

(3%)

0.5

(0.2 to 1.6)

8/93

(9%)

0.3

(0.2 to 0.7)

16/101

(16%)

0.4

(0.2 to 0.7)

West Sweden

1/81

(1%)

0.3

(0.0 to 1.9)

6/74

(8%)

0.4

(0.2 to 1.0)

13/81

(16%)

0.4

(0.2 to 0.8)

East Denmark

4/113

(4%)

1.1

(0.4 to 3.1)

26/103

(25%)

2.1

(1.3 to 3.5)

36/113

(32%)

1.9

(1.2 to 3.0)

Southwest Ireland

6/96

(6%)

1.3

(0.6 to 3.0)

12/85

(14%)

0.7

(0.3 to 1.3)

23/96

(24%)

0.8

(0.5 to 1.3)

Central Italy

16/85

(19%)

5.3

(3.0 to 9.2)

22/63

(35%)

2.6

(1.5 to 4.5)

44/85

(52%)

3.3

(2.1 to 5.2)

Southeast France

8/67

(12%)

3.0

(1.4 to 6.3)

7/57

(12%)

0.5

(0.2 to 1.2)

17/67

(25%)

0.9

(0.5 to 1.7)

Southwest France

6/74

(8%)

1.9

(0.8 to 4.5)

10/63

(16%)

0.7

(0.4 to 1.5)

21/73

(29%)

0.1

(0.7 to 1.9)

Northwest Germany

1/74

(1%)

0.2

(0.0 to 1.8)

6/70

(9%)

0.3

(0.1 to 0.8)

10/74

(14%)

0.3

(0.2 to 0.7)