Table 3: Intralab repetition statistics for low, medium, and high TPH levels.

Lab A B C TPH level (calculated) AVG delta AVG deviation Max delta Max deviation AVG delta AVG deviation Max delta Max deviation AVG delta AVG deviation Max delta Max deviation Low (400–600) 24 12% 80 32% 15 7% 37 24% 38 17% 78 40% Medium (2500–6000) 473 20% 1169 68% 54 2% 183 6% 229 16% 750 35% High (9000–12000) 712 13% 2840 39% 361 10% 861 55% 390 9% 706 18%