SAS Statistical Analysis Regression
rudra
Filltables.docxDistribution of lifestyle risk factor for oral cancer, by sex among cases (n=xx) and controls (n=xx)
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Risk Factors |
Males |
Females |
Total |
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Cases |
Control |
Cases |
Control |
Cases |
Control |
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n (%) |
n (%) |
n (%) |
n (%) |
n (%) |
n (%) |
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Cigarette Smoking |
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Never |
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Ever |
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Current |
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Past |
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Bidi Smoking |
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Never |
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Ever |
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Cigar smoking |
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Never |
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Ever |
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Others smoking |
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Never |
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Ever |
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Alcohol |
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Never |
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Ever |
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Socio-economic status |
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Low |
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Medium |
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High |
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Table 4. Risk of oral cancer associated with the lifestyle risk factors among both sexes (X cases, X controls) derived from conditional logistic regression (conditioned on age and sex).
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Risk Factors |
Cases n (%) |
Controls n (%) |
OR¹ (95% CI) |
OR² (95% CI) |
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Socio-economic status |
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Low |
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Medium |
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High |
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Smoking |
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Never |
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Ever |
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Alcohol |
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Never |
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Ever |
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Chewing |
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Never |
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Ever |
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Current |
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Past |
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Tobacco Pack Years |
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0 |
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1-10 |
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10-2 |
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>20 |
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Second Hand Smoke |
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Yes |
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No |
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OR 1: Basic Model conditioned for age and sex OR2: Basic model adjusted for other variables.
Table 4: Use and risk of oral cancer among men (x cases, x controls), crude and adjusted risk estimates from simple logistic regression.
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Risk Factors |
Cases |
Controls |
OR¹ (95% CI) |
OR² (95% CI) |
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n |
% |
n |
% |
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Smoking Habit |
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Never |
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Ever |
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Current |
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Past |
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Tobacco Pack Years |
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0 |
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1-10 |
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10-2 |
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>20 |
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Bidi Smoking |
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Ever |
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Never |
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Others smoking type |
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Ever |
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Never |
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OR1: Crude Odds Ratio, OR2: Adjusted For age, sex, smoking and alcohol, CI: Confidence interval
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Risk Factors |
Cases |
Controls |
OR¹ (95% CI) |
OR² (95% CI) |
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n |
% |
n |
% |
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Smoking Habit |
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Never |
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Ever |
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Current |
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Past |
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Tobacco Pack Years |
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0 |
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1-10 |
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10-2 |
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>20 |
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Bidi Smoking |
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Ever |
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Never |
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Others smoking type |
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Ever |
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Never |
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OR 1: Crude Odds Ratio, OR2: Adjusted for age, sex, SES, smoking and alcohol, CI: Confidence Interval
Table: Characteristics of oral cancer patients and controls
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Characteristics
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Males |
Females |
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Cases |
Controls |
Cases |
Controls |
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(n=)% |
(n=)% |
(n=)% |
(n=)% |
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Age |
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<50 |
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50-59 |
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60-69 |
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≥70 |
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Educationᵃ (yr) |
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≤12 |
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12 |
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13-15 |
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≥16 |
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Religion ᵇ |
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Hindu |
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Buddhist |
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Christian |
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Other/none |
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Smokingᶜ |
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Never |
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Current |
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Former |
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Cigarettes/dayᵈ |
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1-20 |
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21-39 |
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≥40 |
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Alcoholᵉ |
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0-1/wk |
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Occasional |
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1-4/day |
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4-6/day |
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≥7/day |
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Table 5-3. Cigarette smoking and the risk of oral cancer (odds ratios and 95% confidence intervals) |
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Cases |
Controls |
Crude OR (95% CI) |
Adjusted OR* (95% CI) |
Adjusted OR** (95% CI) |
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Cigarette smoking |
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No smoking |
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Ever smoking |
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Pack years of smoking |
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Continuous (20 years) |
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No smoking |
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119 |
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20-39 |
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≥40 |
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Years since quitting smoking |
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No smoking |
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≥20 years |
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5-19 year |
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1-4 years |
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Current smoking |
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Age at initiation of smoking |
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No smoking |
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≥20 |
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18-19 |
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16-17 |
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<15 |
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Table: Types of cigarette smoked among ever-smoking cases and controls
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Males |
Females |
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Cases |
Controls |
OR |
Cases |
Controls |
OR |
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Filter |
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Nonfilter |
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Table: Age distribution in nonsmoking cases and controls
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Siteᵇ |
NS Cases |
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Men |
Women |
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<50 yr |
≥50 yr |
<50 yr |
≥50 yr |
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Tongue |
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Floor |
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Palette |
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Tonsil |
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Other |
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Total |
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NS Controls |
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NS: never smokers
Table: Cigarette smoking among never drinkers and the risk of oral cancer
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Smoking variable |
Never drinkers |
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Case subjects |
Control subjects |
OR† (95% CI) |
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Cigarette smoking |
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Never |
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Ever |
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Missing |
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Never smokers |
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1-10 |
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11-20 |
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21-30 |
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31-40 |
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>40 |
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Missing |
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OR* adjusted for age (continuous, years), Sex (M/F), race (White/non-white), education (<high school, college, >college)
OR** adjusted for age, sex, ethnicity, education, alcohol drinking
