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Table 12 Dose-response relationships explaining mixed results for the associations between homework and health and well-being indicators

From: School-related sedentary behaviours and indicators of health and well-being among children and youth: a systematic review

Dose of Homework

Unfavourable for Health

Null

Dose of Homework

Favourable for Health

1–2 h/day

(ref: < 1 h/day; 2/10 associations) [149]

> 0–0.5 h/day

(ref: 0 h/day; 2/2 associations) [107]

> 0–2 h/day

(ref: 0 h/day; 1/2 associations) [116]

> 1 h/day

(ref: 0 h/day; 1/2 associations) [107]

> 0–2 h/day

(ref: 0 h/day; 1/2 associations) [116]

1–2 h/day

(ref: <  1 h/day; 1/1 association) [65]

2–3 h/day

(ref: < 1 h/day; 14/18 associations) [149, 150]

0.5–1.9 h/day

(ref: < 0.5 h/day; 2/2 associations) [99]

> 1–3 h/day

(ref: 0–1 h/day; 1/1 association) [150]

≥2 h/day

(ref: < 0.5 h; 2/2 associations) [99]

> 0.5–1 h/day

(ref: 0 h/day; 2/2 associations) [107]

> ~ 2.5 h/day

(ref: <  1 h/day; 1/2 associations) [40]a

> 3 h/day

(ref: <  1 h/day and 0–1 h/day; 11/21 associations) [59, 149, 150, 152]

1–2 h/day

(ref: <  1 h/day; 17/19 associations) [65, 149, 152]

6–8 h/day

(ref: <  4 h; 3/4 associations) [110]b

“Too much homework”

(ref: “just right amount of homework”; 3/4 associations) [105, 106]

1–3 h/day

(ref: <  1 h/day; 2/2 associations) [59]

8–10 h/day

(ref: < 4 h; 2/4 associations) [110]b

 

> 1.0–1.5 h/day

(ref: <  1 h/day; 2/2 associations) [40]a

“High homework” levels (ref: “low homework”; 1/1 association) [89]

 

> 1 h/day

(ref: 0 h/day; 1/2 associations) [107]

 
 

1.5- ~ 2.5 h/day

(ref: <  1 h/day; 2/2 associations) [40]a

 
 

2–3 h/day

(ref: <  1 h/day; 10/18 associations) [149, 152]

 
 

≥2 h/day

(ref: 0 h/day; 4/4 associations) [65, 116]

 
 

> ~ 2.5 h/day

(ref: <  1 h/day; 1/2 associations) [40]a

 
 

> 3 h/day studying

(ref: <  1 h/day; 10/20 associations) [59, 149, 152]

 
 

4–6 h/day

(ref: <  4 h; 4/4 associations) [110]b

 
 

6–8 h/day

(ref: <  4 h; 1/4 associations) [110]b

 
 

8–10 h/day

(ref: <  4 h; 2/4 associations) [110]b

 
 

> 10 h/day

(ref: <  4 h; 4/4 associations) [110]b

 
 

“Not enough homework”

(ref: “just right amount of homework”; 4/4 associations) [105, 106]

 
 

“Medium homework” levels (ref: “low homework”; 1/1 association) [89]

 
 

“Too much homework”

(ref: “just right amount of homework”; 1/4 associations) [105, 106]

 
  1. Ref reference category
  2. a Study categorized homework time in quartiles, with durations changing at each time point. Quartile 1 (Q1): < 1.0 h/day for year 1–3 (Y1-Y3); Q2: > 1.0–1.5 h/day Y1-Y3; Q3: 1.5–2.0 (Y1)/2.5 (Y2)/3.0 (Y3) hours/day; Q4: > 2.0 (Y1)/2.5 (Y2)/3.0 (Y3) h/day
  3. b Time for all studies represent homework, studying, or cram school attendance except this study which measured hours/day spent studying or sitting (sample median: 8–10 h/day of studying or sitting)