Incidence of claims per 10 person-years of eligibility by body part and age group over the period between 2006 and 2010
| FL (n=1475) | MS (n=14 750) | Rate ratio (95% CI; FL/MS) | Risk difference | |||||
|---|---|---|---|---|---|---|---|---|
| n (%) | Eligible months | Incidence (95% CI) | n (%) | Eligible months | Incidence (95% CI) | |||
| Knee | ||||||||
| 18–24 | 21 (6.6) | 9224 | 0.27 (0.16 to 0.39) | 98 (3.1) | 127 456 | 0.09 (0.07 to 0.11) | 2.96 (1.85 to 4.74)* | 0.18 |
| 25–34 | 45 (9.5) | 17 123 | 0.32 (0.22 to 0.41) | 224 (4.7) | 194 272 | 0.14 (0.12 to 0.16) | 2.28 (1.65 to 3.14)* | 0.18 |
| 35–44 | 46 (12.1) | 16 013 | 0.34 (0.25 to 0.44) | 228 (6.0) | 156 098 | 0.18 (0.15 to 0.20) | 1.97 (1.43 to 2.70)* | 0.16 |
| 45–54 | 42 (18.0) | 10 065 | 0.50 (0.35 to 0.65) | 217 (9.3) | 94 339 | 0.28 (0.24 to 0.31) | 1.81 (1.30 to 2.52)* | 0.22 |
| 55+ | 10 (13.9) | 3205 | 0.37 (0.14 to 0.61) | 76 (10.6) | 28 595 | 0.32 (0.25 to 0.39) | 1.17 (0.61 to 2.27) | 0.05 |
| Neck | ||||||||
| 18–24 | 48 (15.2) | 8578 | 0.67 (0.48 to 0.86) | 265 (8.4) | 123 134 | 0.26 (0.23 to 0.29) | 2.60 (1.91 to 3.54)* | 0.41 |
| 25–34 | 116 (24.0) | 15 431 | 0.90 (0.74 to 1.07) | 632 (13.3) | 182 157 | 0.42 (0.38 to 0.45) | 2.17 (1.78 to 2.64)* | 0.48 |
| 35–44 | 104 (27.4) | 13 905 | 0.90 (0.73 to 1.07) | 563 (14.9) | 146 158 | 0.46 (0.42 to 0.50) | 1.94 (1.58 to 2.39)* | 0.44 |
| 45–54 | 59 (25.3) | 9245 | 0.77 (0.57 to 0.96) | 354 (15.2) | 90 522 | 0.47 (0.42 to 0.52) | 1.63 (1.24 to 2.15)* | 0.30 |
| 55+ | 19 (26.4) | 2898 | 0.79 (0.43 to 1.14) | 94 (13.1) | 28 044 | 0.40 (0.32 to 0.48) | 1.97 (1.19 to 3.20)* | 0.39 |
| Low back | ||||||||
| 18–24 | 78 (24.7) | 7652 | 1.22 (0.95 to 1.49) | 530 (16.8) | 115 762 | 0.55 (0.50 to 0.60) | 2.23 (1.76 to 2.83)* | 0.67 |
| 25–34 | 175 (36.8) | 13 722 | 1.53 (1.30 to 1.76) | 1039 (21.9) | 170 258 | 0.73 (0.69 to 0.78) | 2.09 (1.78 to 2.45)* | 0.80 |
| 35–44 | 155 (40.9) | 12 015 | 1.55 (1.30 to 1.79) | 997 (26.3) | 132 873 | 0.90 (0.84 to 0.96) | 1.72 (1.45 to 2.04)* | 0.65 |
| 45–54 | 98 (42.1) | 8044 | 1.46 (1.17 to 1.75) | 657 (28.2) | 81 604 | 0.97 (0.89 to 1.04) | 1.51 (1.22 to 1.87)* | 0.49 |
| 55+ | 39 (54.2) | 2118 | 2.21 (1.52 to 2.90) | 187 (26.0) | 24 893 | 0.90 (0.77 to 1.03) | 2.45 (1.74 to 3.46)* | 1.31 |
| Distal arm | ||||||||
| 18–24 | 16 (5.1) | 9326 | 0.21 (0.10 to 0.31) | 102 (3.2) | 127 268 | 0.10 (0.08 to 0.11) | 2.14 (1.26 to 3.63)* | 0.11 |
| 25–34 | 39 (8.2) | 17 462 | 0.27 (0.18 to 0.35) | 246 (5.2) | 193 359 | 0.15 (0.13 to 0.17) | 1.76 (1.25 to 2.46)* | 0.12 |
| 35–44 | 41 (10.8) | 16 111 | 0.31 (0.21 to 0.40) | 285 (7.5) | 154 330 | 0.22 (0.20 to 0.25) | 1.38 (0.99 to 1.91) | 0.09 |
| 45–54 | 31 (13.3) | 10 421 | 0.36 (0.23 to 0.48) | 215 (9.2) | 94 790 | 0.27 (0.24 to 0.31) | 1.31 (0.90 to 1.91) | 0.09 |
| 55+ | 8 (11.1) | 3316 | 0.29 (0.09 to 0.49) | 58 (8.1) | 29 037 | 0.24 (0.18 to 0.30) | 1.21 (0.58 to 2.53) | 0.05 |
| Shoulder | ||||||||
| 18–24 | 5 (1.6) | 9601 | 0.06 (0.01 to 0.12) | 121 (3.8) | 127 254 | 0.11 (0.09 to 0.13) | 0.55 (0.22 to 1.34) | −0.05 |
| 25–34 | 39 (8.2) | 17 540 | 0.27 (0.18 to 0.35) | 223 (4.7) | 194 015 | 0.14 (0.12 to 0.16) | 1.93 (1.38 to 2.72)* | 0.13 |
| 35–44 | 39 (10.3) | 16 323 | 0.29 (0.20 to 0.38) | 243 (6.4) | 155 364 | 0.19 (0.16 to 0.21) | 1.53 (1.09 to 2.14)* | 0.10 |
| 45–54 | 28 (12.0) | 10 304 | 0.33 (0.21 to 0.45) | 205 (8.8) | 94 787 | 0.26 (0.22 to 0.30) | 1.26 (0.85 to 1.86) | 0.07 |
| 55+ | 11 (15.3) | 3236 | 0.41 (0.17 to 0.65) | 60 (8.3) | 29 173 | 0.25 (0.18 to 0.31) | 1.65 (0.87 to 3.14) | 0.16 |
| Other LE | ||||||||
| 18–24 | 12 (3.8) | 9343 | 0.15 (0.07 to 0.24) | 146 (4.6) | 126 335 | 0.14 (0.12 to 0.16) | 1.11 (0.62 to 2.00) | 0.01 |
| 25–34 | 25 (5.3) | 17 731 | 0.17 (0.10 to 0.24) | 312 (6.6) | 192 475 | 0.19 (0.17 to 0.22) | 0.87 (0.58 to 1.31) | −0.02 |
| 35–44 | 45 (11.9) | 16 052 | 0.34 (0.24 to 0.43) | 308 (8.1) | 153 891 | 0.24 (0.21 to 0.27) | 1.40 (1.02 to 1.92)* | 0.10 |
| 45–54 | 23 (9.9) | 10 586 | 0.26 (0.15 to 0.37) | 229 (9.8) | 94 146 | 0.29 (0.25 to 0.33) | 0.89 (0.58 to 1.37) | −0.03 |
| 55+ | 12 (16.7) | 3266 | 0.44 (0.19 to 0.69) | 69 (9.6) | 28 900 | 0.29 (0.22 to 0.35) | 1.54 (0.83 to 2.84) | 0.15 |
| Multiple MSDs | ||||||||
| 18–24 | 62 (19.6) | 8393 | 0.89 (0.67 to 1.11) | 293 (9.3) | 123 730 | 0.28 (0.25 to 0.32) | 3.12 (2.37 to 4.10)* | 0.61 |
| 25–34 | 133 (28.0) | 15 031 | 1.06 (0.88 to 1.24) | 682 (14.4) | 183 317 | 0.45 (0.41 to 0.48) | 2.38 (1.98 to 2.86)* | 0.61 |
| 35–44 | 135 (35.6) | 13 510 | 1.20 (1.00 to 1.40) | 693 (18.3) | 144 367 | 0.58 (0.53 to 0.62) | 2.08 (1.73 to 2.50)* | 0.62 |
| 45–54 | 82 (35.2) | 8773 | 1.12 (0.88 to 1.36) | 514 (22.1) | 87 459 | 0.71 (0.64 to 0.77) | 1.59 (1.26 to 2.01)* | 0.41 |
| 55+ | 29 (40.3) | 2667 | 1.30 (0.83 to 1.78) | 131 (18.2) | 27 172 | 0.58 (0.48 to 0.68) | 2.26 (1.51 to 3.37)* | 0.72 |
Incidence=number of individuals with claims per 10 person-years of eligibility during the period; rate ratio: incidence of FL/incidence of MS people; risk difference: the difference between the incidence of FL to the incidence of MS people.
*Indicates rate ratios with significant difference between the FL rate and MS cohort rate since the lower bound is above 1.0.
FL, floor layers; LE, lower extremity; MS, MarketScan; MSDs, musculoskeletal disorders.