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Table 3 P-values for matching variables

From: Selecting a comparison group for 5-year oral and pharyngeal cancer survivors: Two methods

  Sample Size* P-Value
Group Survivor Peer Listed Survivor vs. Peer# Survivor vs. Listed$ Quality of Matching^^
Variable       
Sex of subject! 100 44 96 0.47 1.00 0.99
Age (yrs)!! 100 44 96 0.017 0.79 1.00
Education! 99 44 96 0.75 0.41 0.018
Employment! 100 44 96 0.18 0.25 0.28
Days of smoking in the past 30 100 44 96 0.07 0.23 0.77
Lifetime duration of smoking 60 27 53 0.32 0.011 0.18
How often do you drink alcohol? (during month) 100 44 95 0.77 0.44 0.23
How much alcohol do you drink on a typical day when you are drinking? (number of drinks) 99 42 95 0.40 0.26 0.53
How often do you drink six drinks of alcohol in one day? (during month) 100 34 95 0.51 0.42 0.25
  1. *: sample sizes vary due to missing data.
  2. #: Two-sided p-values for testing Ho: “the marginal distribution of survivors is the same as that of peers” vs. Ha: ”the two marginal distributions are different”. The smaller the p-value, the larger the difference between the two marginal distributions.
  3. $: Two-sided p-values for testing Ho: ”the marginal distribution of survivors is the same as that of listed sample” vs. Ha: ”the two marginal distributions are different”. The smaller the p-value, the larger the difference between the two marginal distributions.
  4. ^^: One-sided p-values for testing Ho: ”the quality of matching between peers and survivors is the same as that between listed samples and survivors” vs. Ha: ”the quality of matching between peers and survivors is better than that between listed samples and survivors”.