Diameter (μm) | Length (μm) | ||||||
⩽1.5 | 1.5–5 | 5–10 | 10–20 | 20–40 | >40 | All | |
<0.25 | |||||||
β | 0.023 | 0.047 | 0.259 | 0.493 | 1.311 | 3.503 | 0.015 |
−2LL | 2499.2 | 2496.7 | 2498.0 | 2496.2 | 2492.5 | 2489.3 | 2495.9 |
χ21df | 53.2 | 55.7 | 54.3 | 56.2 | 59.9 | 63.0 | 56.4 |
0.25–1.0 | |||||||
β | 1.089 | 0.237 | 0.646 | 1.190 | 2.986 | 2.861 | 0.134 |
−2LL | 2513.9 | 2516.7 | 2504.5 | 2501.9 | 2486.5 | 2495.5 | 2506.4 |
χ21df | 38.5 | 35.6 | 47.8 | 50.5 | 65.9 | 56.9 | 46.0 |
1.0–3.0 | |||||||
β | NA† | 1.693 | 1.061 | 1.840 | 3.558 | 14.107 | 0.490 |
−2LL | 2536.1 | 2512.1 | 2503.9 | 2495.4 | 2493.4 | 2506.6 | |
χ21df | 16.2 | 40.3 | 48.5 | 57.0 | 59.0 | 45.8 | |
>3.0 | |||||||
β | NA† | NA† | 5.268 | 4.935 | 7.562 | 5.978 | 2.047 |
−2LL | 2536.4 | 2518.0 | 2517.7 | 2516.1 | 2509.4 | ||
χ21df | 15.9 | 34.3 | 34.7 | 36.3 | 42.9 | ||
All | |||||||
β | 0.023 | 0.041 | 0.164 | 0.323 | 0.705 | 1.255 | 0.013 |
−2LL | 2498.7 | 2498.2 | 2499.3 | 2492.2 | 2490.3 | 2491.8 | 2494.7 |
χ21df | 53.7 | 54.1 | 53.0 | 60.1 | 62.1 | 60.5 | 57.6 |
*Results from models with a 0-year lag that included variables controlling for gender, race, calendar time and time since first employment.
†These categories do not meet the 3:1 length to width fibre definition that was a part of our TEM analysis counting rules. However, a very small percentage (<0.1%) of the counted fibres did fall into these categories.