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Table 4 Absolute changes in level of physical activity between pre- and post-diagnosis by baseline socio-demographic and clinical factors

From: Longitudinal changes in sports activity from pre-diagnosis to first five years post-diagnosis: a prospective Chinese breast cancer cohort study

Characteristics N % Changes in MET-hours/week,
mean ± SD
P value
Total 1019 100.0 3.7 ± 12.1  
Age at diagnosis, year 0.011
 < 40 92 9.0 4.2 ± 10.8
 40–49 329 32.3 4.8 ± 11.2
 50–59 394 38.7 4.0 ± 12.5
 ≥ 60 204 20.0 1.3 ± 13.2
Education 0.918
 High school or below 868 85.2 3.7 ± 12.5
 Collage or above 151 14.8 3.6 ± 9.5
Marital status 0.006
 Married or cohabitating 728 71.4 4.3 ± 12.6
 Unmarried or divorced or widowed 291 28.6 2.2 ± 10.8
Household income, HKD/month 0.059
 < 15,000 463 45.4 3.2 ± 12.9
 15,000-30,000 326 32.0 4.2 ± 11.3
 30,000-50,000 151 14.8 2.6 ± 12.3
 ≥ 50,000 79 7.8 6.7 ± 10.4
Employment status < 0.001
 Full time 378 37.1 2.3 ± 13.4
 Part time 129 12.7 1.7 ± 14.2
 Not working 512 50.2 5.2 ± 10.3
Menopausal status 0.299
 Premenopausal 539 52.9 4.7 ± 11.6
 Postmenopausal 480 47.1 2.6 ± 12.6
BMI at diagnosis, kg/m2 0.086
 Underweight (< 18.5) 37 3.6 5.1 ± 13.5
 Normal (18.5–22.9) 488 47.9 4.1 ± 12.3
 Overweight (23–24.9) 209 20.5 4.6 ± 12.1
 Obese (≥25) 285 28.0 2.2 ± 11.6
Number of comorbidities 0.002
 None 629 61.7 4.8 ± 12.0
 1 259 25.4 2.2 ± 12.7
 2 101 9.9 1.2 ± 10.8
 ≥ 3 30 2.9 1.3 ± 11.4
AJCC stage at diagnosis 0.352 a
 0-I 375 36.9 3.2 ± 11.7
 II 471 46.2 3.9 ± 13.1
 III 169 16.6 4.4 ± 10.3
 Missing 4 0.4 −5.0 ± 10.3
Histology 0.437
 IDC 858 84.2 3.6 ± 12.2
 ILC 31 3.0 6.4 ± 11.4
 DCIS 56 5.5 2.3 ± 10.0
 Others 74 7.3 4.7 ± 13.3
ER status 0.394 a
 Positive 763 74.9 3.8 ± 11.5
 Negative 233 22.9 3.6 ± 14.0
 Missing 23 2.3 0.3 ± 11.4
PR status 0.214 a
 Positive 598 58.7 4.0 ± 11.8
 Negative 395 38.8 3.5 ± 12.6
 Missing 26 2.6 −0.2 ± 11.8
HER 2 status 0.124 a
 Positive 274 26.9 3.7 ± 12.8
 Negative 686 67.3 4.0 ± 12.1
 Missing 59 5.8 0.6 ± 9.4
Surgery 0.648
 Mastectomy 628 61.6 3.8 ± 13.1
 Conservation 391 38.4 3.5 ± 10.4
Chemotherapy 0.127
 Yes 774 76.0 4.0 ± 12.7
 No 245 24.0 2.7 ± 10.1
Radiotherapy 0.944
 Yes 721 70.8 3.7 ± 11.7
 No 298 29.2 3.7 ± 13.2
Endocrine therapy 0.789
 Yes 777 76.3 3.6 ± 11.2
 No 242 23.7 3.9 ± 14.6
Smoking status 0.455
 Yes 11 1.1 1.0 ± 3.7
 No 1008 98.9 3.7 ± 12.2
Drinking status 0.866
 Yes 15 1.5 4.2 ± 11.6
 No 1004 98.5 3.7 ± 12.1
  1. a Missing group did not include in P value test
  2. Abbreviations: MET metabolic equivalent of task, SD standard deviation, HKD Hong Kong dollars, BMI body mass index, AJCC American joint Committee on cancer, IDC invasive ductal carcinoma, ILC invasive lobular carcinoma, DCIS ductal carcinoma in situ, ER estrogen receptor, PR progesterone receptor, HER 2 human epidermal-growth-factor receptor 2
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