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Table 1 Between-visit correlation coefficients of HPV type-specific and combined viral load measurements at entry and follow-up visits in the McGill-Concordia cohort.

From: Human papillomavirus (HPV) types 16, 18, 31, 45 DNA loads and HPV-16 integration in persistent and transient infections in young women

   Correlation coefficient with visit at
HPV type Visit at 6 months 12 months 18 months 24 months
16 Entry 0.5232* (30) 0.3181 (20) 0.2046 (14) 0.4583 (6)
  6 months   0.7561** (27) 0.6764** (21) 0.4282 (10)
  12 months    0.8295** (30) 0.5810* (17)
  18 months     0.8043** (24)
18 Entry 0.0103 (10) 0.5481 (5) ND ND
  6 months   0.3132 (11) 0.6612 (5) 0.2290 (4)
  12 months    0.0173 (8) 0.1732 (6)
  18 months     0.1655 (8)
31 Entry 0.9562** (6) 0.4242 (5) 0.5133 (5) 0.2410 (3)
  6 months   0.2427 (6) 0.8063* (5) 0.5138 (5)
  12 months    0.1930 (11) 0.3575 (7)
  18 months     0.7289* (12)
45 Entry 0.3648 (6) ND ND ND
  6 months   0.7376 (3) ND ND
  12 months   ND 0.9745 (3) ND
  18 months     ND
Above HPV types combined Entry 0.4122* (53) 0.4044* (37) 0.3769* (23) 0.6103* (12)
  6 months   0.6190** (49) 0.6126** (36) 0.2280 (22)
  12 months    0.5752** (49) 0.1391 (33)
  18 Months     0.4116* (44)
  1. HPV loads were measured with type-specific PCR assays and expressed as logarithmic transformation before computing correlations. Pearson correlation coefficients are shown with number of visit pairs jointly positive for the stated type or combination in parenthesis. ND: not determined because only 2 pairs were evaluable.
  2. * denotes significance at 5% level of significance; ** denotes significance at 1% level of statistical significance.