Table 2.
Phase transition parameters
| Phase transition parameter | Meibum |
Age-related difference | ||
|---|---|---|---|---|
| below 14 years | 14–35 years | above 35 years | ||
| Age (mean ± SD), years | 8 ± 1 | 22 ± 4 | 67 ± 4 | |
| Minimum frequency, cm−1 | 2,849.37 ± 0.08 | 2,849.82 ± 0.08 | 2,849.9 ± 0.1 | below 14 years, p < 0.01 |
| Maximum frequency, cm−1 | 2,853.31 ± 0.31 | 2,853.4 ± 0.1 | 2,853.4 ± 0.1 | r = 0.115; p > 0.05 |
| Cooperativity | −9.4 ± 0.5 | −8.4 ± 0.6 | −9.0 ± 0.5 | r = 0.054; p > 0.05 |
| Phase transition temperature, °C | 31.3 ± 0.9 | 29.9 ± 0.4 | 28.2 ± 0.5 | r = 0.576; p > 0.005 |
| Enthalpy, kcal/mol | 154 ± 8 | 135 ± 10 | 146 ± 8 | r = 0.0597; p > 0.05 |
| Entropy, kcal/mol/degree | 0.51 ± 0.03 | 0.45 ± 0.03 | 0.48 ± 0.03 | r = 0.0411; p > 0.05 |
| Phase transition fit (r) | 0.999 | 0.997 | 0.997 | |
| Order at 33.4°C, % | 50 ± 4 | 40 ± 2 | 27 ± 2 | r = 0.501; p > 0.005 |
| Number of samples | 7 | 12 | 8 | |