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Table 4 10-year survival of NPC patients in different propensity score strata; low/medium-volume vs. high-volume physiciansa

From: Survival rate in nasopharyngeal carcinoma improved by high caseload volume: a nationwide population-based study in Taiwan

Propensity score stratum Low/medium-volume physician group High-volume physician group p
  No. % of stratum Survival rate (%) No. % of stratum Survival rate (%)  
1 193 79 56 51 21 75 0.004
2 191 78 59 52 22 74 0.029
3 173 70 57 74 30 75 0.013
4 145 58 64 104 42 76 0.021
5 116 48 69 126 52 76 0.28
Total 818   61 407 33 75 < 0.001
  1. a. Stratum 1 had the strongest propensity for low/medium physicians; stratum 5, for high-volume physicians.
  2. b. Conchran-Mantel-Haenszel statistics; adjusted odds ratio = 0.54, 95% confidence interval = 0.41-0.70.