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Table 1 Sociodemographic, cognitive and sleep variables at 6 and 12 months

From: Sleep during infancy, inhibitory control and working memory in toddlers: findings from the FinnBrain cohort study

Sociodemographic variables, categorical
  N (%)
Gender (girls/boys) 166 (45.9) / 196 (54.1)
Birth order (first/other) 183 (52.1) / 168 (47.9)
Maternal education level, pregnancy (primary/secondary/higher) 81 (23.1) / 113 (32.2) / 157 (44.7)
Sociodemographic variables, continuous
  Mean (SD) Min Max
Child’s age at 30 months of EF assessment, days 917.13 (13.75) 883.00 986.00
Gestational age at birth, weeks 39.81 (1.52) 31.86 42.43
Maternal age when baby born, years 31.04 (4.28) 19.00 42.00
Infant birth weight, kg 3.57 (0.50) 1.47 5.47
Infant birth height, cm 50.62 (2.23) 39.00 57.00
Number of siblings 0.74 (0.87) 0.00 5.00
Cognitive variables, at 30 months
 INTER-NDA Mean Cognitive Score 3.57 (0.32) 1.92 4.00
 Snack Delay, total score 27.91 (8.27) 0.00 36.00
 Spin the Pots, total score 11.99 (3.53) 3.00 16.00
Sleep variables at 6 months
 BISQ nighttime sleep duration, hours 9.87 (1.17) 1.00 12.00
 BISQ daytime time sleep duration, hours 3.82 (1.29) 1.50 11.00
 BISQ total sleep duration, hours 13.66 (1.50) 5.50 18.50
 BISQ proportion daytime sleep, % 27.48 (7.66) 12.00 81.82
 BISQ number of awakenings / night 2.41 (1.60) 0.00 11.00
 BISQ time awake / night, hours 0.44 (0.44) 0.00 2.00
Sleep variables at 12 months
 BISQ nighttime sleep duration, hours 10.26 (0.98) 4.00 13.00
 BISQ daytime time sleep duration, hours 2.61 (1.17) 1.00 11.00
 BISQ total sleep duration, hours 12.75 (1.02) 7.00 16.00
 BISQ proportion daytime sleep, % 19.64 (5.40) 8.00 38.00
 BISQ number of awakenings / night 1.85 (1.36) 0.00 8.00
 BISQ time awake / night, hours 0.32 (0.52) 0.00 5.00
  1. INTER-NDA INTERGROWTH-21st Neurodevelopmental Assessment, BISQ Brief Infant Sleep Questionnaire, SD Standard deviation