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Table 3 Study 2: Objectively measured physical activity at baseline and follow-up by study condition and total sample

From: Examining the impact of a province-wide physical education policy on secondary students’ physical activity as a natural experiment

 

Comparison (Alberta) (n=224)

Intervention (Manitoba) (n =447)

Total (n = 671)

 

Accelerometer data

n

(%)

n

(%)

n

(%)

P value

Students with valid MVPA at time point

 T0: Pre-policy

224

(100.0)

447

(100.0)

671

(100.0)

N.A.

 T1: February 2009 – June 2009

120

(53.6)

167

(37.4)

287

 

N.A.

 T2: September 2009 – January 2010

20

(8.9)

94

(21.0)

114

(42.8)

N.A.

 T3: February 2010 – June 2010

67

(29.9)

232

(51.9)

299

(17.0)

N.A.

 T4 : September 2010 – January 2011

21

(9.4)

54

(12.1)

75

(44.6)

N.A.

 T5 : February 2011 – June 2011

0

(0)

124

(27.7)

124

(11.2)

N.A.

 T6 : September 2011 – January 2012

14

(6.3)

44

(9.8)

58

(18.5) (8.6)

N.A.

Times points contributed/ student, mean ± SD

2.1

0.8

2.6

1.1

2.4

1.0

<.0001*

Baseline MVPA

 Students with baseline data

224

(100.0)

447

(100.0)

671

(100.0)

N.A.

 Minutes/day, mean ± SD

53.0

21.9

58.3

24.0

56.5

 

0.0039

 Accumulated ≥ 30 min/day

194

(86.6)

396

(88.6)

590

23.4

 

 Accumulated ≥ 60 min/day

76

(33.9)

199

(44.5)

275

(87.9) (41.0)

0.4571

0.0085

MVPA at students’ last follow-up

 Students with ≥ 1 follow up data

165

(73.7)

340

(76.1)

505

(75.3)

0.4965

 Minutes/day, mean ± SD

49.4

22.2

44.1

23.7

45.8

23.3

0.0143*

 Accumulated ≥ 30 min/day (% with ≥ 1 follow up)

131

(79.4)

231

(67.9)

362

(71.7)

0.0074

 Accumulated ≥ 60 min/day (% with ≥ 1 follow up)

48

(29.1)

71

(20.9)

119

(23.6)

0.0415

MVPA change from baseline to last follow up

       

 Change (min/day), mean ± SD

-3.7

25.3

-13.4

26.2

-10.3

26.3

<.0001*

 Mean percentage change (%), mean ± SD

14.2

130.5

-15.9

49.6

-6.1

86.0

0.0047*

  1. N.A. denotes not applicable
  2. *Student’s t-test was used to compare across study condition
  3. Chi-square test was used to compare across study condition
  4. P-value = comparison of comparison and intervention cohorts