Table 3

Crude odds ratios (unadj.OR) and adjusted odds ratios (adj. OR) for the prediction of physical activity (PA) in the final logistic regression model (model 5) for boys (n = 3 225)1

3-5 times/week vs. nearly every day

1-2 times/week vs. nearly every day

1-2 times/month or less vs. nearly every day

Predictors

unadj. OR (95% CI)

adj. OR (95% CI)

unadj. OR (95% CI)

adj. OR (95% CI)

unadj. OR (95% CI)

adj. OR (95% CI)


Age (OR per year)

1.11 (1.06-1.16)

1.14 (0.99-1.31)*

1.15 (1.09-1.21)

1.19 (1.05-1.34)*

1.36 (1.24-1.48)

1.71 (1.43-2.04)*


Pubic hair stage


advanced/mature

1.64 (1.07-2.53)

0.81 (0.41-1.63)*

1.51 (0.97-2.36)

0.70 (0.34-1.44)*

2.19 (1.11-4.29)

0.27 (0.09-0.78)*

early/mid-puberty

1.21 (0.79-1.86)

0.84 (0.51-1.39)*

1.14 (0.74-1.76)

0.88 (0.50-1.53)*

0.81 (0.38-1.74)

0.36 (0.15-0.86)*

prepubescent (ref.)

1.00

1.00

1.00

1.00

1.00

1.00


Voice change/mutation


deep voice

1.50 (1.24-1.81)

0.92 (0.55-1.54)

1.63 (1.31-2.03)

1.11 (0.69-1.81)

2.89 (2.05-4.06)

0.52 (0.27-1.00)

fluctuating voice

1.18 (0.91-1.53)

0.97 (0.67-1.40)

1.07 (0.80-1.41)

0.97 (0.67-1.42)

1.35 (0.89-2.03)

0.64 (0.39-1.07)

no change (ref.)

1.00

1.00

1.00

1.00

1.00

1.00


Pubertal timing


early

0.78 (0.60-1.01)

0.92 (0.68-1.26)

0.74 (0.56-0.98)

0.97 (0.70-1.34)

0.96 (0.65-1.41)

2.20 (1.36-3.56)

late

0.68 (0.50-0.92)

0.67 (0.43-1.04)

0.81 (0.61-1.07)

0.83 (0.57-1.23)

0.67 (0.46-0.97)

0.57 (0.33-0.98)

average (ref.)

1.00

1.00

1.00

1.00

1.00

1.00


Body dissatisfaction (BDS)


much too fat

1.35 (0.81-2.26)

1.09 (0.59-2.03)*

1.80 (1.12-2.90)

0.98 (0.54-1.77)*

2.61 (1.48-4.58)

1.37 (0.61-3.08)*

slightly too fat

1.20 (0.96-1.51)

1.05 (0.81-1.38)*

1.57 (1.21-2.05)

1.14 (0.82-1.58)*

1.33 (0.93-1.90)

0.93 (0.61-1.43)*

(much) too thin

1.23 (0.97-1.56)

1.22 (0.95-1.57)*

1.50 (1.14-1.96)

1.52 (1.16-2.00)*

1.40 (0.97-2.02)

1.24 (0.84-1.83)*

exactly right weight (ref.)

1.00

1.00

1.00

1.00

1.00

1.00


1Fully adjusted odds ratios are adjusted for the baseline model variables (sociodemographic variables and body fat percentage), all listed predictors, and significant two-way-interactions at alpha = 5%; significant ORs (p ≤ .05) in bold type.

* Predictor is part of a significant two-way-interaction term, odds ratios were therefore calculated separately for different strata of the predictor (see table 4); odds ratios given in this table are those of the main-effects-only model and therefore unadjusted for the interaction-terms.

Finne et al. International Journal of Behavioral Nutrition and Physical Activity 2011 8:119   doi:10.1186/1479-5868-8-119

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