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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.