Table 2.
The number of days for which only THC personal samples were available; both VOs and THC measurements were available for development of the prediction equation; VOC-derived ‘THC’ TWA estimates were developed; and either a THC personal sample or a VOC-derived ‘THC’ TWA estimate was available. The last column identifies the percentage increase in the number of available measurements for estimating AMs for each ROV vessel and MV.
| Type of vessel | Vessel name | N days with THC personal samples | N days used for regression of VOC to THCa | N days with VOC-derived ‘THC’ TWA estimates | N days with a VOC or THC measurement | Percentage increase of covered days due to VOC-derived estimatesb |
|---|---|---|---|---|---|---|
| ROV vessels | BOA Deep C | 49 | 14 | 30 | 79 | 61.2 |
| BOA Sub C | 63 | 15 | 21 | 84 | 33.3 | |
| Casey Chouest | 8 | 2 | 5 | 13 | 62.5 | |
| Chouest Holiday | 35 | 0 | 27 | 62 | 77.1 | |
| Helix Express | 10 | 0 | 48 | 58 | 480 | |
| HOS Achiever | 32 | 0 | 42 | 74 | 131.3 | |
| Iron Horse | 11 | 0 | 12 | 23 | 109.1 | |
| Normand Fortress | 17 | 11 | 0 | 17 | 0 | |
| Ocean Intervention I | 15 | 2 | 2 | 17 | 13.3 | |
| Ocean Intervention III | 90 | 67 | 25 | 115 | 27.8 | |
| Olympic Challenger | 39 | 2 | 18 | 57 | 46.2 | |
| REM Forza | 77 | 9 | 26 | 103 | 33.8 | |
| Skandi Neptune | 110 | 38 | 16 | 126 | 14.5 | |
| All ROV vessels | 556 | 160 | 272 | 828 | 49 | |
| Marine vessels | Adriatic | 1 | 0 | 38 | 39 | 3800 |
| Blue Dolphin | 8 | 0 | 26 | 34 | 325 | |
| Helix Producer | 9 | 0 | 26 | 35 | 288.9 | |
| HOS Strongline | 15 | 0 | 9 | 24 | 60 | |
| Loch Rannoch | 16 | 0 | 4 | 20 | 25 | |
| Massachusetts | 10 | 0 | 19 | 29 | 190 | |
| Monica Ann | 40 | 0 | 24 | 64 | 60 | |
| Normand Commander | 54 | 0 | 7 | 61 | 13 | |
| Odyssea Diamond | 28 | 0 | 23 | 51 | 82.1 | |
| Overseas Cascade | 2 | 0 | 11 | 13 | 550 | |
| Seacor Pride | 19 | 0 | 4 | 23 | 21.1 | |
| Seacor Reliant | 12 | 0 | 1 | 13 | 8.3 | |
| Seacor Vanguard | 2 | 0 | 9 | 11 | 450 | |
| Seacor Venture | 35 | 0 | 3 | 38 | 8.6 | |
| Stim Star 3 | 10 | 0 | 3 | 13 | 30 | |
| Tyler Stephen | 57 | 0 | 11 | 68 | 19.3 | |
| War Admiral | 20 | 0 | 5 | 25 | 25 | |
| All marine vessels | 338 | 0 | 223 | 561 | 66.0 | |
| All marine and ROV vessels | 894 | 160 | 495 | 1389 | 56.6 |
a This number (N) is included in the THC personal measurement day count as it is the number of days with at least three non-censored THC samples with corresponding VOC measurements coverage.
b [(Total number of days with THC measurements or ‘THC’ estimates/N THC measurements) × 100] − 100 to obtain the increase above the THC measurements.