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Table 4 Pearson coefficient correlation (r) and Bland-Altman agreement analysis for quantitative measures of lowest CD4+ T-cell count and highest viral load before cART between HIV-BCS and SISCEL databases

From: Validation of CD4+ T-cell and viral load data from the HIV-Brazil Cohort Study using secondary system data

Sites of HIV-BCSa CD4+ T-cell HIV viral load (log)
Correlation Agreement Correlation Agreement
r p-value Mean Diff CI95%c p-value# r p-value Mean Diff CI95%c p-value#
I 0.994 < 0.001 0.16 − 1.22 to 1.55 0.815 0.997 < 0.001 0.0110 −0.040 to 0.017 0.429
II 0.974 < 0.001 0.14 −0.67 to 0.95 0.733 0.990 < 0.001 −0.0026 −0.032 to 0.027 0.859
III 0.956 < 0.001 0.71 −2.96 to 4.39 0.701 0.979 < 0.001 0.0075 −0.048 to 0.063 0.790
IV 0.921 < 0.001 0.00 b b 0.994 < 0.001 − 0.0040 −0.039 to 0.031 0.822
V 0.997 < 0.001 0.00 b b 0.995 < 0.001 − 0.0100 −0.031 to 0.011 0.327
VI 0.990 < 0.001 1.38 −1.7 to 4.51 0.386 0.965 < 0.001 −0.0110 − 0.040 to 0.018 0.453
VII 0.995 < 0.001 −0.03 −0.11 to 0.38 0.318 0.989 < 0.001 −0.0026 −0.036 to 0.035 0.989
VIII 0.956 < 0.001 −0.02 −2.17 to 2.12 0.981 0.950 < 0.001 −0.0050 −0.020 to 0.009 0.466
IX 0.946 < 0.001 0.85 −2.02 to 3.70 0.562 0.973 < 0.001 −0.0170 − 0.051 to 0.016 0.312
X 0.978 < 0.001 0.84 −1.85 to 3.54 0.540 0.965 < 0.001 0.0060 −0.010 to 0.030 0.634
XI 0.942 < 0.001 −0.96 −3.51 to 1.59 0.460 0.975 < 0.001 0.0030 −0.014 to 0.021 0.686
XII 0.967 < 0.001 −0.50 −1.5 to 0.58 0.361 0.990 < 0.001 0.0040 −0.027 to 0.035 0.800
XIII 0.971 < 0.001 −0.36 −2.00 to 1.33 0.673 0.966 < 0.001 0.0110 −0.017 to 0.020 0.903
Total 0.970 < 0.001 0.073 −0.07 to 0.88 0.861 0.971 < 0.001 −0.0025 −0.010 to 0.005 0.509
  1. # Null hypothesis means (DIFF) = 0
  2. aI - Manaus – FMT; II - Belém UREDIP; III - Santarém - Municipal STF; IV - Recife - HC/UFPE; V - J. Guararapes - MUNICIPAL STF; VI - Salvador – HUPES; VII - Salvador - CEDAP; VIII - Rio de Janeiro – IPEC; IX Belo Horizonte - UFMG; X - São Paulo - CRT/SP; XI - São Paulo - Municipal Network; XII - SAE S.J.R.P - MUNICIPAL STF; XIII - Porto Alegre – PARTENON;
  3. bStatistics were not calculated because the standard deviation is zero;
  4. cIncluding upper and higher limits of the confidence interval CI95%