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Table 2 Growth curve of rPDL cells and hPDL cells by plotting mean optical density over time

From: Lapine periodontal ligament stem cells for musculoskeletal research in preclinical animal trials

Days Groupsa Mean ± standard deviation (N = 9) Pairwise comparisonb
Between groups Within group
P value Group 1 Group 2
Day 1 1 0.017 ± 0.007 0.182 Day 1 <  Day 1 < 
2 0.025 ± 0.016   Day 2 <   Day 2 <
Day 2 1 0.085 ± 0.019 0.437 Day 4 < Day 4 <
2 0.100 ± 0.054   Day 6 < Day 6 <
Day 4 1 0.306 ± 0.061 0.000* Day 8 <  Day 8 < 
2 0.588 ± 0.061   Day 10 < Day 10 =
Day 6 1 0.551 ± 0.099 0.000* Day 12 <  Day 12 =
2 2.255 ± 0.148   Day 14 Day 14
Day 8 1 0.915 ± 0.186 0.000*   
2 2.510 ± 0.144    
Day 10 1 1.268 ± 0.189 0.000*   
2 2.764 ± 0.075    
Day 12 1 1.585 ± 0.070 0.000*   
2 2.818 ± 0.052    
Day 14 1 1.939 ± 0.121 0.000*   
2 2.868 ± 0.060    
  1. S.E standard error
  2. aGroup 1: rPDL cells; Group 2: hPDL cells
  3. bAdjustment for multiple comparisons: Bonferroni
  4. * Statistically significant at p < 0.05
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