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Table 1 Demographic characteristics of the study population at baseline

From: 24-h movement behaviors from infancy to preschool: cross-sectional and longitudinal relationships with body composition and bone health

   All POI participants Those with at least one set of dataa n (%) Those with at least one set of dataa and DXA at 5 years n (%)
n   802 380 257
Maternal variables
 Age at child’s birth (y) Mean (SD) 31.6 (5.2) 32.5 (4.7) 33.2 (4.4)
 Ethnicity n (%) New Zealand European 682 (85.1) 299 (78.7) 216 (84.1)
Māori 46 (5.7) 36 (9.5) 18 (7.0%)
Other 73 (9.1) 45 (11.8) 23 (9.0)
Missing 1 2 0
 Parity n (%) Primiparous 382 (47.6) 187 (49.2) 124 (48.3)
Multiparous 420 (52.4) 193 (50.8) 133 (51.8)
 Educationb n (%) School only 193 (24.1) 78 (20.6) 48 (18.8)
Post-secondary 116 (14.6) 50 (13.2) 36 (14.1)
University degree or higher 485 (61.1) 250 (66.1) 172 (67.2)
Missing 8 2 1
 Pre-pregnancy BMI (kg/m2) Mean (SD) 25.1 (5.0) 25.4 (5.1) 25.3 (5.2)
Household or infant variables
 Household deprivationc 1–3 (Low) 276 (34.8) 140 (37.0) 102 (40.0)
4–7 350 (43.6) 171 (45.2) 111 (43.5)
8–10 (High) 168 (21.2) 67 (17.7) 42 (16.5)
Missing 8 2 2
 Infant sex Male 391 (48.8) 195 (51.3) 125 (48.6)
Female 411 (51.2) 185 (48.7) 132 (51.4)
 Infant birth weight (kg) Mean (SD) 3551 (480) 3576 (492) 3581 (496)
  1. Data presented as n (%) unless otherwise indicated
  2. aAt least 3 days of accelerometry at 1, 2, 3.5 or 5 years of age
  3. bSecondary schooling in New Zealand is from year 9 to year 13 inclusive, ‘post-secondary qualifications’ refer to all tertiary qualifications that are not University based
  4. cUses the New Zealand Index of Deprivation 2013 which combines nine variables from the 2013 census relating to communication (no access to the internet at home), income (receiving a means tested benefit or living below income thresholds), unemployment, qualifications, home ownership, single parent families, living space, and transport access. A deprivation score is provided for each meshblock which is a geographical unit defined by Statistics New Zealand containing about 60–110 people. The score reflects the extent of material and social deprivation and is used to construct deciles from 1 (least deprived) to 10 (most deprived)