Table 4

Poisson regression model of PTA failurea in the PAD cases for various time periods in Taiwan
Cohort I: PTAs performed during 2000-2001 Cohort II: PTAs performed during 2004-2005 Cohort III: PTAs performed during 2008-2009
Descriptive data for both failed patterns No. (%) No. (%) No. (%)
Enrolled cases 1,265 5,356 10,258
  Referred for bypass within 2 years 92 7.27% 201 3.75% 215 2.10%
  Referred for amputation within 2 years 188 14.86% 437 8.16% 873 8.51%
Period effectb of PTAs Failure (RR, 95% C.I.) 1.00 0.92 0.80-1.04 0.92 0.80-1.06
Analytic data for all PTA failed cases RR (95% CI) RR (95% CI) RR (95% CI)
Age Stratum
30-49.9 y/o 1.00 1.00 1.00
50-64.9 y/o 3.54 1.68 ~ 5.49 1.45 0.84 ~ 1.85 1.10 0.73 ~ 1.42
65-74.9 y/o 4.95 2.41 ~ 10.13 1.54 0.82 ~ 1.76 1.17 0.78 ~ 1.50
75 y/o or more 4.56 2.22 ~ 9.36 1.63 0.83 ~ 1.79 0.92 0.72 ~ 1.19
Gender
Male vs female 0.87 0.69 ~ 1.11 0.85 0.72-0.99 1.10 0.97 ~ 1.26
Co-morbidities (CCI Index)
Higher (≥4) vs lower 1.54 0.95 ~ 2.43 1.31 1.02 ~ 1.67 1.46 1.20 ~ 1.77
Socioeconomic level
Low-income vs other 1.22 0.39 ~ 3.82 1.39 0.74 ~ 2.59 0.58 0.34 ~ 0.99

RR: risk ratio.

Note: a: This means that all the patients needed to be treated with additive bypass surgery or amputation within 2 years after their PTA procedure. b: Crude relative ratio of period effect is to compare with the PTAs failure rate in period I and to keep off age-period interaction.

Chang et al.

Chang et al. BMC Public Health 2013 13:1107   doi:10.1186/1471-2458-13-1107

Open Data