Table 2 Verification of the 4 °C mathematical models by semi-quantitative RT-PCR.

From: Circular RNA circFat3 as a biomarker for construction of postmortem interval Estimation models in mouse brain tissues at multiple temperatures

Temperature

circRNAs

Reference gene

Real PMI

Estimation PMI

Estimation Error

Error rate (%)

Equation

4 °C

circFat3

mt-co1

2d

6.5100

4.5100

225.50%

Linear

2d

4.8609

2.8609

143.05%

Quadratic

2d

3.6304

1.6304

81.52%

Cubic

6.25d

7.1388

0.8888

14.22%

Linear

6.25d

5.3294

0.9206

14.73%

Quadratic

6.25d

4.0436

2.2064

35.30%

Cubic

9.25d

8.9496

0.3004

3.25%

Linear

9.25d

6.8177

2.4323

26.30%

Quadratic

9.25d

5.7316

3.5184

38.04%

Cubic

28S rRNA

2d

4.5425

2.5425

127.12%

Linear

2d

4.4217

2.4217

121.09%

Quadratic

2d

4.9791

2.9791

148.95%

Cubic

6.25d

6.3275

0.0775

1.24%

Linear

6.25d

6.1563

0.0937

1.50%

Quadratic

6.25d

6.4622

0.2122

3.40%

Cubic

9.25d

5.9675

3.2825

35.49%

Linear

9.25d

5.8037

3.4463

37.26%

Quadratic

9.25d

6.1710

3.0790

33.29%

Cubic

mt-co1/28S rRNA

2d

7.5351

5.5351

276.75%

Linear

2d

6.4697

4.4697

223.49%

Quadratic

2d

6.2229

4.2229

211.15%

Cubic

6.25d

8.0597

1.8097

28.96%

Linear

6.25d

6.9590

0.7090

11.34%

Quadratic

6.25d

6.7930

0.5430

8.69%

Cubic

9.25d

8.3524

0.8976

9.70%

Linear

9.25d

7.2398

2.0102

21.73%

Quadratic

9.25d

7.1280

2.1220

22.94%

Cubic