Table 2.
Multivariable logistic regression model relating drop-out between SPARCLE1 and SPARCLE2 to characteristics recorded in SPARCLE1
| Reason for drop-out: | (i) Not traced n/N = 51/805 (6%) | (ii) Death n/N = 32/754* (4%) | (iii) Refusal n/N = 119/710**(17%) | (iv) All non-response n/N = 214/804 (27%) | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |
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) | ||||||||
n = number of non-respondents; N = total number analysed; % = percentage non-responders; OR = odds ratio; CI = confidence interval; p = likelihood ratio test statistic p-value for removal of characteristic from model; OR above 1.0 indicate a greater risk of non-response in that category than in the reference category.
For variables with more than two categories, 95%CI were based on quasi-variances [18].
* The denominator for analysis of deaths was all traced families.
** The denominator for analysis of refusal was all traced families with live children, excluding those who had moved out of the region (13 families) or who had language problems (1 family).