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.

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)


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.

* denotes significance at 5% level of significance; ** denotes significance at 1% level of statistical significance.

Ramanakumar et al. BMC Infectious Diseases 2010 10:326   doi:10.1186/1471-2334-10-326

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