Table 2.
Unadjusted and adjusted relative risk (RR) of remaining inactive (compared with those who became active) from 11 to 15 years, according to the examined predictors (in the inactive cohort at 11 years); 1993 Pelotas (Brazil) birth Cohort Study, 2004–2008
| Unadjusted analyses | Adjusted analyses | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Boys (n 1058) | Girls (n 1527) | Boys (n 965) | Girls (n 570) | |||||||||
| Predictor | RR | 95 % CI | P value | RR | 95 % CI | P value | RR | 95 % CI | P value | RR | 95 % CI | P value |
| Skin colour | 0·04 | 0·68 | 0·08 | 0·83 | ||||||||
| White | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | ||||
| Mixed | 0·98 | 0·84, 1·15 | 0·99 | 0·92, 1·06 | 1·01 | 0·86, 1·19 | 0·99 | 0·92, 1·06 | ||||
| Black | 0·75 | 0·60, 0·94 | 0·97 | 0·90, 1·05 | 0·77 | 0·62, 0·97 | 0·98 | 0·90, 1·06 | ||||
| Socio-economic level | 0·04* | 0·68* | 0·05* | 0·63* | ||||||||
| Poorest | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | ||||
| Intermediate | 1·07 | 0·92, 1·25 | 0·97 | 0·92, 1·04 | 1·08 | 0·93, 1·27 | 0·97 | 0·90, 1·03 | ||||
| Wealthiest | 1·17 | 1·01, 1·35 | 0·99 | 0·93, 1·05 | 1·16 | 1·00, 1·35 | 0·98 | 0·92, 1·05 | ||||
| Mother's LTPA change | 0·01* | <0·01* | <0·01* | <0·01* | ||||||||
| Always zero | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | ||||
| Decreased | 0·85 | 0·70, 1·03 | 0·98 | 0·91, 1·05 | 0·81 | 0·67, 0·98 | 0·96 | 0·89, 1·04 | ||||
| Increased <150 min/week | 0·93 | 0·75, 1·14 | 0·91 | 0·81, 1·02 | 0·86 | 0·69, 1·07 | 0·90 | 0·81, 1·02 | ||||
| Increased ≥150 min/week | 0·77 | 0·61, 0·96 | 0·85 | 0·76, 0·92 | 0·73 | 0·58, 0·92 | 0·83 | 0·75, 0·93 | ||||
| Exposure during growing up | <0·01 | <0·01 | <0·01 | <0·01 | ||||||||
| Mostly indoors | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | ||||
| Mostly outdoors | 0·76 | 0·65, 0·89 | 0·89 | 0·83, 0·96 | 0·73 | 0·62, 0·85 | 0·89 | 0·82, 0·96 | ||||
| Fear of living in the neighbourhood | <0·01 | 0·53 | <0·01 | 0·59 | ||||||||
| Never | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | ||||
| No longer | 0·91 | 0·73, 1·12 | 0·97 | 0·89, 1·05 | 0·91 | 0·74, 1·13 | 0·94 | 0·86, 1·04 | ||||
| Developed | 0·92 | 0·72, 1·17 | 0·94 | 0·86, 1·03 | 0·88 | 0·68, 1·13 | 0·97 | 0·89, 1·05 | ||||
| Always | 1·45 | 1·19, 1·78 | 0·98 | 0·87, 1·10 | 1·44 | 1·15, 1·79 | 0·98 | 0·88, 1·10 | ||||
| BMI status at 11 years | 0·78* | 0·04* | 0·88* | 0·01* | ||||||||
| Normal | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | ||||
| Overweight | 0·97 | 0·79, 1·18 | 0·98 | 0·90, 1·05 | 0·95 | 0·75, 1·22 | 0·96 | 0·88, 1·05 | ||||
| Obese | 1·03 | 0·88, 1·21 | 0·89 | 0·80, 0·99 | 0·99 | 0·81, 1·22 | 0·87 | 0·77, 0·98 | ||||
| Sexual maturation in quartiles | 0·26* | 0·24* | ||||||||||
| 1 (least) | 1·00 | Ref. | – | – | 1·00 | Ref. | – | – | ||||
| 2 | 0·99 | 0·83, 1·18 | – | – | 1·00 | 0·84, 1·20 | – | – | ||||
| 3 | 0·94 | 0·76, 1·15 | – | – | 0·88 | 0·71, 1·09 | – | – | ||||
| 4 (most) | 0·88 | 0·69, 1·12 | – | – | 0·90 | 0·72, 1·16 | – | – | ||||
| Age of menarche | 0·53 | 0·17 | ||||||||||
| Before 12 years | – | – | 1·00 | Ref. | – | – | 1·00 | Ref. | ||||
| 12 years or older | – | – | 0·98 | 0·93, 1·04 | – | – | 0·96 | 0·91, 1·01 | ||||
| Screen time change in tertiles | 0·16* | 0·33* | 0·22* | 0·23* | ||||||||
| Least | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | 1·00 | Ref. | ||||
| Intermediate | 0·97 | 0·84, 1·11 | 1·06 | 1·00, 1·13 | 0·95 | 0·78, 1·14 | 1·06 | 1·00, 1·13 | ||||
| Highest | 0·90 | 0·78, 1·04 | 0·96 | 0·90, 1·03 | 0·89 | 0·74, 1·07 | 0·95 | 0·88, 1·02 | ||||
LTPA, leisure-time physical activity; Ref., referent category.
*P value for linear trend.