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. 2009 Jan 16;5(1):e1000343. doi: 10.1371/journal.pgen.1000343

Table 1. The relationship between excavation year and the proportion of contaminant clone sequences.

Proportion of contaminant clone sequences Excavation Yeara Correlation
Sequence fragment N Mean (S.E.) Mean (S.E.) Spearman's ρ P-value
16055-16218 87 0.18 (0.021) 1946.5 (2.46) −0.214 0.046
16055-16410 48 0.27 (0.042) 1948.8 (3.68) −0.026 0.861
16209-16410 79 0.18 (0.024) 1947.1 (2.39) −0.26 0.021
16517-160 85 0.17 (0.023) 1945.3 (2.5) −0.505 <10−6
16517-334/409 19 0.26 (0.07) 1948 (5.74) −0.533 0.019
183-334/409 68 0.19 (0.018) 1947.8 (2.54) −0.113 0.36
All fragments 386 0.19 (0.011) 1946.9 (1.15) −0.259 <10−6
a

The range of excavation years was 1880 to 1996 for all sequence fragments, except for 16517-334/409 and 183-334/409, which were 1909 and 1901, respectively.