TABLE 2.
Description of Those With and Without Back Pain and Those With and Without Days Off School in the Last 6 Months Because of Pain
| No Back Pain n = 2665 | Back Pain n = 519 | P for Difference | 0–6 days off school n = 1340 | 7 or more days off school n = 198 | P value for difference | |
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | |
| 17.7 (0.4) | 17.8 (0.4) | P = 0.074 | 17.7 (0.4) | 17.8 (0.4) | P = 0.079 | |
| Age at Time of Back Pain Measure (yrs) | N (%) | N (%) | N (%) | N (%) | N (%) | N (%) |
| Gender | P = 0.091 | P < 0.001 | ||||
| Male | 1170 (43.9) | 207 (39.9) | 554 (41.3) | 56 (28.3) | ||
| Female | 1495 (56.1) | 312 (60.1) | 789 (58.7) | 142 (71.7) | ||
| Maternal education | P = 0.241 | P = 0.125 | ||||
| 1 | 239 (9.6) | 59 (12.5) | 131 (10.6) | 23 (12.2) | ||
| 2 | 167 (6.7) | 35 (7.4) | 70 (5.7) | 16 (8.5) | ||
| 3 | 836 (33.6) | 162 (34.4) | 413 (33.4) | 72 (38.3) | ||
| 4 | 723 (29.0) | 127 (27.0) | 366 (19.6) | 49 (26.1) | ||
| 5 | 526 (21.1) | 88 (18.7) | 256 (20.7) | 28 (14.9) | ||
| Ethnicity | P = 0.258 | P = 0.043 | ||||
| White | 2360 (96.0) | 444 (94.9) | 1178 (96.2) | 171 (92.9) | ||
| Nonwhite | 98 (4.0) | 24 (5.1) | 47 (3.8) | 13 (7.1) | ||
| BMI at time of back pain measure | P = 0.005 | P = 0.455 | ||||
| Underweight (<18.5) | 237 (9.1) | 36 (7.1) | 98 (7.5) | 11 (5.8) | ||
| Ideal weight (18.5–24.9) | 1837 (70.4) | 350 (68.6) | 912 (69.4) | 136 (71.6) | ||
| Overweight (25.0–29.9) | 388 (14.9) | 75 (14.7) | 202 (15.4) | 24 (12.6) | ||
| Obese (≥30) | 147 (5.6) | 49 (9.6) | 102 (7.8) | 19 (10.0) | ||