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Table 3 Quality of data obtained on 2-year parent-reported neurodevelopmental outcome measures by mode of questionnaire completion

From: Telephone interviews and online questionnaires can be used to improve neurodevelopmental follow-up rates

Outcome measure

Postal (n = 1296)

Telephone/online (n = 126)

RR [95% CI]

p

Proportion of missing data, n (%)

Neurosensory impairmentb

0 (0.0)

0 (0.0)

-

-

Cognitive impairmenta

149 (0.3)

92 (2.1)

6.35 [1.97 to 20.47]

0.002

Proportion of missing data excluding online premature terminations, n (%)

Neurosensory impairment

0 (0.0)

0 (0.0)

-

-

Cognitive impairment

149 (0.3)

24 (0.6)

1.68 [0.25 to 11.27]

0.59

Prevalence of adverse outcomes, n (%)

Neurosensory impairment

30 (2.3)

5 (4.0)

1.71 [0.67 to 4.42]

0.26

Cognitive impairment

169 (13.3)

13 (10.8)

0.82 [0.46 to 1.44]

0.48

Proportion of adverse outcomes adjusted for significant differences in response mode c

Neurosensory impairment

-

-

1.91 [0.73, 4.99]

0.19

Cognitive impairment

-

-

0.82 [0.46, 1.44]

0.40

  1. Cognitive impairment was assessed using the Parent Report of Children’s Abilities-Revised (PARCA-R). aThe proportion of missing data was calculated using the 34 non-verbal sub-scale items alone. bNeurosensory impairment was measured using 4 items assessing vision, hearing, communication and neuromotor function. cAdjusted for ethnic group, language, multiple birth and preterm birth.