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Table 2 Renal cell carcinoma in relation to physical activity at age 20s and 50s, by race

From: Physical activity and renal cell carcinoma among black and white Americans: a case-control study

  Black White p for interaction
  Controls, no. (%)a Cases, no. (%)a Odds ratio (95% CI)b Controls, no. (%)a Cases, no. (%)a Odds ratio (95% CI)b  
Physical activity during age 20’s
Walking or biking for transportation, hr/wk 0.17
<1 122 (24) 89 (25) 1.06 (0.73, 1.53) 232 (32) 335 (39) 1.42 (1.10, 1.83)  
1-7 150 (29) 102 (28) 1.00 (0.72, 1.38) 273 (40) 307 (36) 1.06 (0.80, 1.39)  
>7 243 (47) 165 (46) ref 198 (28) 212 (25) ref  
p trend    0.77    0.01  
Moderate to strenuous leisure time activity, hr/wk    0.57
<1 94 (16) 65 (18) 1.16 (0.79, 1.71) 100 (14) 134 (16) 1.10 (0.81, 1.48)  
1-7 193 (35) 131 (37) 1.10 (0.79, 1.53) 352 (50) 412 (48) 0.98 (0.78, 1.25)  
>7 230 (48) 161 (44) ref 155 (36) 307 (36) ref  
p trend    0.41    0.65  
Moderate to strenuous work activity, hr/wk     0.68
<1 119 (19) 65 (19) 1.07 (0.68, 1.67) 232 (34) 283 (32) 1.05 (0.81, 1.36)  
1-10 95 (18) 79 (21) 1.18 (0.82, 1.70) 134 (19) 159 (19) 1.05 (0.74, 1.48)  
11-20 53 (11) 29 (9) 0.75 (0.44, 1.30) 88 (12) 73 (9) 0.71 (0.50, 1.02)  
>20 202 (43) 155 (43) ref 208 (29) 271 (32) ref  
p trend    0.96    0.45  
Total activity scorec 0.07
2-4 80 (13) 42 (12) 1.14 (0.68, 1.92) 118 (17) 168 (19) 1.35 (0.91, 2.01)  
5-6 135 (24) 99 (28) 1.37 (0.94, 2.00) 243 (35) 297 (35) 1.16 (0.84, 1.63)  
7-8 141 (31) 113 (32) 1.24 (0.84, 1.82) 236 (34) 266 (32) 0.97 (0.71, 1.33)  
9-10 159 (32) 99 (28) ref 103 (14) 119 (15) ref  
p trend    0.30    0.06  
Physical activity during age 50’s
Walking or biking for transportation, hr/wk 0.17
<1 134 (38) 95 (36) 0.78 (0.50, 1.22) 249 (47) 305 (48) 0.98 (0.67, 1.45)  
1-7 133 (39) 96 (37) 0.79 (0.51, 1.24) 212 (41) 235 (38) 0.90 (0.60, 1.34)  
>7 78 (22) 68 (27) ref 66 (13) 80 (13) ref  
p trend    0.31    0.83  
Moderate to strenuous leisure time activity, hr/wk    0.21
<1 80 (24) 61 (23) 0.84 (0.50, 1.43) 72 (13) 120 (19) 1.49 (1.00, 2.20)  
1-7 159 (43) 113 (44) 1.06 (0.68, 1.65) 295 (55) 316 (50) 0.95 (0.72, 1.25)  
>7 107 (32) 85 (32) ref 158 (32) 185 (30) Ref  
p trend    0.58    0.09  
Moderate to strenuous work activity, hr/wk     0.71
<1 98 (27) 60 (23) 0.86 (0.56, 1.32) 197 (37) 226 (36) 0.98 (0.73, 1.31)  
1-10 67 (19) 55 (21) 1.19 (0.70, 2.01) 122 (23) 111 (18) 0.72 (0.50, 1.04)  
11-20 36 (12) 17 (6) 0.53 (0.28, 1.01) 51 (10) 53 (8) 0.79 (0.50, 1.23)  
>20 115 (34) 86 (34) ref 121 (22) 159 (26) ref  
p trend    0.89    0.88  
Total activity scorec 0.14
2-4 82 (22) 63 (24) 1.03 (0.58, 1.84) 133 (24) 180 (28) 1.50 (0.95, 2.41)  
5-6 104 (31) 53 (33) 1.01 (0.57, 1.77) 220 (40) 222 (36) 1.21 (0.76, 1.92)  
7-8 102 (30) 66 (26) 0.93 (0.55, 1.57) 142 (27) 171 (29) 1.29 (0.80, 2.10)  
9-10 55 (17) 44 (17) ref 48 (9) 45 (8) ref  
p trend    0.79    0.12  
  1. aPercentages are weighted.
  2. bAdjusted for study center (Detroit or Chicago), age (20-44, 45-54, 55-64, 65-74, 75+ years), sex (male, female), education (<12 years, high school, some college, 4+ years of college), smoking status (never, occasional, former, current), and history of cancer among first-degree relatives (none, cancer other than kidney cancer, kidney cancer, unknown).
  3. cNumeric scores were assigned to each category of physical activities (Transportation and leisure activities: 1, 2, and 3 for <1, 1-7 and >7 hr/wk, respectively; work activity: 0, 1, 2, 3, and 4 for none, <1, 1-10, 11-20 and >20 hr/wk, respectively). Total scores were calculated by combining all the activity scores of each person at different age periods.
  4. In these analysis, we excluded people with missing information on specific types of physical activity (transportation: N = 15 for age 20’s and N = 8 for age 50’s; leisure-time: N = 9 for age 20’s and N = 8 for age 50’s; work: N = 7 for age 20’s and N = 4 for age 50’s). Additionally, participants who did not work either full-time or part time were also excluded from the analysis of work activity (N = 191 for age 20’s and 181 for age 50’s).