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Table 3 Concentration Index from 1991 to 2011

From: Prevalence and income-related equity in hypertension in rural China from 1991 to 2011: differences between self-reported and tested measures

Year Self-reported hypertension Tested hypertension
C 95%CI C 95%CI
1991 0.118 0.023 0.213 0.088 0.044 0.132
1993 0.144 0.055 0.232 −0.003 − 0.043 0.038
1997 0.064 −0.020 0.148 −0.008 −0.040 0.025
2000 0.052 −0.008 0.112 0.010 −0.020 0.040
2004 0.110 0.058 0.161 0.031 0.002 0.059
2006 0.119 0.071 0.168 −0.030 −0.058 −0.001
2009 0.065 0.026 0.104 0.006 −0.020 0.032
2011 0.032 −0.002 0.065 −0.024 −0.047 − 0.00009