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Table 4 Results of Multivariate quantile regression analysis for predictors of stroke direct costs

From: Analysing and quantifying the effect of predictors of stroke direct costs in South Africa using quantile regression

Variables Quantiles τ
  τ = 0.1 τ = 0.25 τ=0.5 τ= 0.75 τ = 0.95
  βj 95% CI of βj βj 95% CI of βj βj 95% CI of βj βj 95% CI of βj βj 95% CI of βj
Intercept 1.152*** (1.150,1.155) 1.702*** (1.601,1.721) 2.740*** (2.709,2.745) 2.870*** (2.670,2.900) 1.587*** (1.580,1.600)
Female-gender 1.020*** (1.000,1.300) 2.100*** (1.999,2.345) 1.999*** (1.980,2.000) 0.987*** (0.897,1.12) 2.981*** (2.890,3.008)
Age group
55–75 years
1.217*** (1.200,1.220) 1.113*** (1.110,1.118) 1.563*** (1.556,1.600) 1.946*** (1.941,1.956) 1.008*** (1.000,1.113)
Age group
76–98 years
1.531*** (1.430,1.630) 1.804*** (1.800,1.987) 1.738*** (1.730,1.745) 1.940*** (1.899,1.989) 1.227*** (1.117,1.312)
Indian/Asian-race 2.000*** (0.999,2.10) 1.093*** (1.090,1.246) 1.738*** (1.678,1.741) 1.357*** (1.346,1.455) 1.880*** (1.788,1.908)
Black-race 1.551*** (1.457,1.601) 2.500*** (2.167,2.560) 1.986*** 1.980,2.100) 1.984*** (1.982,1.999) 1.315*** (1.301,1.412)
Coloured-race 2.698 (−2.598,2.708) 2.470 (−2.430,2.500) 1.476 (−1.46,1.56) 3.423 (−3.404,3.523) 1.553 (−1.550,1.555)
Hypertension-yes 3.249*** (3.200,3.250) 2.157*** (2.100,2.200) 3.419*** (3.314,3.519) 2.528*** (2.428,2.556) 3.230*** (3.123,3.340)
Cholesterol-yes 2.511*** (1.519,2.545) 2.612*** (2.610,2.810) 2.510*** (2.455,2.567) 2.257*** (2.250,2.307) 1.049*** (1.044,1.056)
Heart problems-yes 3.149*** (3.129,3.250) 2.418*** (2.319,2.420) 2.981*** (2.980,3.100) 3.201*** (3.199,3.389) 2.295*** (2.195,2.305)
Diabetes-yes 4.213*** (4.205,5.200) 3.214*** (3.115,3.250) 2.846*** (2.840,2.855) 2.589*** (2.458,2.609) 3.553*** (3.500,3.633)
Hospitalisation-cost 4.189*** (4.109,4.190) 1.989*** (1.900,2.109) 1.000*** (0.899,1.201) 1.283*** (1.183,1.294) 2.788*** (2.688,2.808)
Outpatient-cost 1.000*** (0.998,1.100) 1.715*** (1.700,1.812) 1.936*** (1.914,1.956) 2.415*** (2.399,2.546) 1.607*** (1.606,1.610)
Medication-cost 1.486*** (1.398,1.506) 1.416*** (1.400,1.420) 1.274*** (1.266,1.298) 1.117*** (1.100,1.207) 1.775*** (1.700,1.805)
Physiotherapy-cost 1.186*** (1.109,1.190) 1.065*** (1.054,1.070) 2.902*** (2.900,2.912) 2.889*** (2.880,2.909) 1.725*** (1.720,1.743)
Speech therapy-cost 1.026*** (0.978,1.342) 1.817*** (1.619,1.817) 1.967*** (1.890,2.070) 2.129*** (2.109,2.234) 1.725*** (1.712,1.730)
  1. Note: τ= quantile, βj= coefficient, 95%CI = 95% confidence interval, *p < 0.05, **p < 0.01, ***p < 0.0001. All coefficients are per 5-year period