Table 2.
Additional. Patient baseline demographic characteristics, comorbidities, and health status measures according to patient follow-up status as of 09/03/2013 when the DS 8yr data were pulled.
| Patients currently in study (n=337) |
Patients lost to follow-up (n=264) |
p-value | |
|---|---|---|---|
| Mean Age (SD) | 63.6 (9.4) | 69.2 (10.5) | <0.001 |
| Female - no. (%) | 234 (69%) | 178 (67%) | 0.66 |
| Ethnicity: Not Hispanic - no. (%)† | 330 (98%) | 257 (97%) | 0.85 |
| Race - White - no. (%) | 293 (87%) | 213 (81%) | 0.048 |
| Education - At least some college - no. (%) | 238 (71%) | 162 (61%) | 0.021 |
| Marital Status - Married - no. (%) | 230 (68%) | 166 (63%) | 0.2 |
| Work Status - no. (%) | <0.001 | ||
| Full or part time | 145 (43%) | 73 (28%) | |
| Disabled | 31 (9%) | 20 (8%) | |
| Retired | 121 (36%) | 136 (52%) | |
| Other | 40 (12%) | 35 (13%) | |
| Compensation - Any - no. (%)‡ | 31 (9%) | 10 (4%) | 0.014 |
| Mean Body Mass Index (BMI), (SD)§ | 29.2 (5.7) | 29.2 (6.8) | 1 |
| Smoker - no. (%) | 26 (8%) | 25 (9%) | 0.54 |
| Comorbidities - no. (%) | |||
| Diabetes | 36 (11%) | 44 (17%) | 0.043 |
| Osteoporosis | 40 (12%) | 29 (11%) | 0.83 |
| Heart Problem | 54 (16%) | 68 (26%) | 0.004 |
| Depression | 58 (17%) | 40 (15%) | 0.57 |
| Joint Problem | 185 (55%) | 159 (60%) | 0.22 |
| Bodily Pain (BP) Score (SD)‖ | 34.5 (19.7) | 31.7 (18.3) | 0.075 |
| Physical Functioning (PF) Score (SD) | 35.9 (21.8) | 32.3 (23) | 0.054 |
| Mental Component Summary (MCS) Score (SD) | 50.2 (11.5) | 50 (11.6) | 0.78 |
| Oswestry (ODI) (SD)** | 42.1 (17.8) | 40.9 (17.9) | 0.43 |
| Stenosis Frequency Index (0–24) (SD)†† | 13.9 (5.3) | 14.1 (5.9) | 0.65 |
| Stenosis Bothersome Index (0–24) (SD)‡‡ | 14.7 (5.4) | 14.6 (5.8) | 0.81 |
| Back Pain Bothersomeness (SD)§§ | 4.3 (1.8) | 4.2 (1.8) | 0.81 |
| Leg Pain Bothersomeness (SD)¶¶ | 4.6 (1.6) | 4.5 (1.7) | 0.91 |
| Pseudoclaudication - Any - no. (%) | 289 (86%) | 222 (84%) | 0.65 |
| Dermatomal pain radiation - no. (%) | 261 (77%) | 207 (78%) | 0.86 |
| Any Neurological Deficit - no. (%) | 178 (53%) | 149 (56%) | 0.42 |
| Reflexes - Asymmetric Depressed | 86 (26%) | 64 (24%) | 0.79 |
| Sensory - Asymmetric Decrease | 96 (28%) | 73 (28%) | 0.89 |
| Motor - Asymmetric Weakness | 75 (22%) | 71 (27%) | 0.22 |
| No. moderate or severe stenotic levels - no. (%) | 0.088 | ||
| None | 16 (5%) | 7 (3%) | |
| One | 218 (65%) | 152 (58%) | |
| Two | 85 (25%) | 87 (33%) | |
| Three+ | 18 (5%) | 18 (7%) | |
| Stenosis Locations - no. (%) | |||
| Central | 303 (90%) | 246 (93%) | 0.2 |
| Lateral Recess | 313 (93%) | 233 (88%) | 0.071 |
| Neuroforamen | 151 (45%) | 92 (35%) | 0.017 |
| Stenosis Severity - no. (%) | 0.21 | ||
| Mild | 16 (5%) | 7 (3%) | |
| Moderate | 126 (37%) | 89 (34%) | |
| Severe | 195 (58%) | 168 (64%) | |
| Instability - no. (%)******* | 29 (9%) | 18 (7%) | 0.51 |
| HRQOL Scales ****** | |||
| Bodily Pain (BP) Score (SD)‖ | 34.5 (19.7) | 31.7 (18.3) | 0.075 |
| Physical Functioning (PF) Score (SD) | 35.9 (21.8) | 32.3 (23) | 0.054 |
| Oswestry (ODI) (SD)** | 42.1 (17.8) | 40.9 (17.9) | 0.43 |