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Table 3 Relative risk ratios and 95% confidence intervals for predictors of trajectory class membership, Birth-to-Twenty+

From: Longitudinal patterns of physical activity, sedentary behavior and sleep in urban South African adolescents, Birth-To-Twenty Plus cohort

Males Females
  RRR (95% CI)   RRR (95% CI)
Informal Physical Activity
 Class 1--- decreasing (ref)  Class 1--- decreasing (ref)
 Class 2--- increasing  Class 2--- decreasing then increase at 16 y
  SES (asset quintile) 1.48 (1.11–1.98)   SES (asset quintile) 0.95 (0.71–1.29)
  mother’s schooling 0.59 (0.26–1.34)   mother’s schooling 1.04 (0.45–2.43)
  mother’s marriage/union status 0.48 (0.23–1.01)   mother’s marriage/union status 0.71 (0.32–1.58)
  parity 0.59 (0.28–1.24)   parity 0.70 (0.32–1.52)
  Pseudo R2 0.04   Pseudo R2 0.006
Organized Sports
 Class 1--- consistently low (ref)  Class 1--- no participation (ref)
 Class 2--- increasing  Class 2--- some participation
  SES (asset quintile) 0.86 (0.68–1.10)   SES (asset quintile) 1.04 (0.84–1.30)
  mother’s schooling 1.53 (0.81–2.87)   mother’s schooling 0.93 (0.51–1.71)
  mother’s marriage/union status 1.15 (0.63–2.10)   mother’s marriage/union status 0.76 (0.42–1.36)
  parity 1.25 (0.69–2.29)   parity 1.07 (0.62–1.86)
 Class 3--- decreasing
  SES (asset quintile) 1.00 (0.75–1.33)   
  mother’s schooling 1.01 (0.48–2.14)   
  mother’s marriage/union status 0.87 (0.43–1.75)   
  parity 1.31 (0.66–2.61)   
 Pseudo R2 0.007  Pseudo R2 0.003
Walking to and from school
 Class 1--- lower (ref)  Class 1--- lower (ref)
 Class 2--- higher  Class 2--- higher
  SES (asset quintile) 0.81 (0.66–0.98)   SES (asset quintile) 0.68 (0.58–0.81)
  mother’s schooling 0.55 (0.31–0.99)   mother’s schooling 0.47 (0.28–0.80)
  mother’s marriage/union status 0.70 (0.43–1.14)   mother’s marriage/union status 1.12 (0.73–1.72)
  parity 0.69 (0.42–1.14)   parity 0.84 (0.55–1.29)
 Pseudo R2 0.04  Pseudo R2 0.07
Sedentary Behavior
 Class 1--- stable lower (ref)  Class 1--- increasing (ref)
 Class 2--- increasing’  Class 2--- stable higher
  SES (asset quintile) 1.08 (0.86–1.36)   SES (asset quintile) 1.29 (0.99–1.67)
  mother’s schooling 1.64 (0.91–2.96)   mother’s schooling 1.50 (0.76–2.94)
  mother’s marriage/union status 1.46 (0.83–2.56)   mother’s marriage/union status 1.18 (0.62–2.25)
  parity 1.11 (0.63–1.98)   parity 0.78 (0.40–1.51)
 Class 3--- stable higher
  SES (asset quintile) 1.06 (0.85–1.34)   
  mother’s schooling 1.82 (1.02–3.25)   
  mother’s marriage/union status 1.52 (0.87–2.65)   
  parity 1.14 (0.76–2.35)   
 Pseudo R2 0.02  Pseudo R2 0.03
School-night Sleep
 Class 1--- 9 h/night (ref)  Class 1---8 h/night (ref)
 Class 2--- 8 h/night  Class 2---9 h/night
  SES (asset quintile) 1.10 (0.93–1.29)   SES (asset quintile) 0.82 (0.70–0.95)
  mother’s schooling 2.43 (1.58–3.74)   mother’s schooling 0.46 (0.30–0.72)
  mother’s marriage/union status 1.35 (0.90–2.02)   mother’s marriage/union status 0.80 (0.54–1.18)
  parity 0.70 (0.46–1.07)   parity 0.90 (0.62–1.32)
 Class 3--- 10 h/night  Class 3--- 6.5 h/night
  SES (asset quintile) 0.79 (0.59–1.04)   SES (asset quintile) 1.11 (0.84–1.45)
  mother’s schooling 0.55 (0.20–1.50)   mother’s schooling 1.18 (0.59–2.32)
  mother’s marriage/union status 0.76 (0.38–1.53)   mother’s marriage/union status 1.10 (0.54–2.13)
  parity 0.49 (0.23–1.02)   parity 1.81 (0.93–3.52)
 Class 4--- 7 h/night
  SES (asset quintile) 1.40 (0.95–2.06)   
  mother’s schooling 3.63 (1.47–8.98)   
  mother’s marriage/union status 1.32 (0.55–3.17)   
  parity 1.19 (0.49–2.90)   
 Pseudo R2 0.05  Pseudo R2 0.04
Weekend Sleep
 Class 1--- 9.5 h/night (ref)  Class 1--- 9 h/ night (ref)
 Class 2--- 11 h/night  Class 2---10 h/night
  SES (asset quintile) 1.02 (0.83–1.24)   SES (asset quintile) 1.01 (0.87–1.17)
  mother’s schooling 0.56 (0.32–1.05)   mother’s schooling 1.07 (0.71–1.62)
  mother’s marriage/union status 0.82 (0.50–1.25)   mother’s marriage/union status 1.14 (0.78–1.68)
  parity 0.65 (0.39–1.09)   parity 1.06 (0.73–1.54)
 Class 3--- 7.5 h/night  Class 3--- 8 h/night
  SES (asset quintile) 1.30 (0.95–1.79)   SES (asset quintile) 1.10 (0.86–1.43)
  mother’s schooling 0.97 (0.43–2.16)   mother’s schooling 1.38 (0.67–2.78)
  mother’s marriage/union status 1.00 (0.47–2.13)   mother’s marriage/union status 1.16 (0.60–2.26)
  parity 0.92 (0.43–1.97)   parity 0.90 (0.46–1.74)
    Class 4--- 11 h/night
     SES (asset quintile) 1.04 (0.76–1.43)
     mother’s schooling 1.53 (0.64–3.65)
     mother’s marriage/union status 0.87 (0.38–1.97)
     parity 0.42 (0.17–1.02)
 Pseudo R2 0.02  Pseudo R2 0.006
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BMC Pediatrics

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