Table 2.
Description of individuals with midback and neck pain stratified by latent class analysis, Spine Centre of Southern Denmark.
| LCA-class characteristics | All MBPNP individuals n = 5658 |
Class 1: MBPNP bilateral posterior n = 1124 (19.9%)  |
Class 2: MBPNP unilateral posterior + anterior n = 1334 (23.6%)  |
Class 3: MBPNP unilateral posterior n = 2570 (45.4%)  |
Class 4: Widespread pain n = 630 (11.1%)  |
P and pairwise comparisons (P < 0.05) |
|---|---|---|---|---|---|---|
| Sex, females (%) | 58.2% | 57.4% | 60.8% | 55.3% | 66.5% |
*P < 0.01 all comparisons except MBPNP unilateral posterior + anterior (P adj. = 0.57), MBPNP unilateral posterior (P adj. = 1) vs MBPNP bilateral posterior; MBPNP unilateral posterior + anterior vs widespread pain (P adj. = 0.1) |
| Age, y, median (IQR) | 51 (41-60) | 48 (37-59) | 51 (42-59) | 53 (42.2-62) | 48 (38-55) |
†P < 0.001 all comparisons except MBPNP bilateral posterior vs widespread pain (P adj. = 1) |
| BMI‡, median (IQR) Missings, n (%) Outliers, n (%) |
26 (24-30) 71 (1.3%) 1 (0.02%) |
27 (24-30) | 27 (24-30) | 26 (23-29) | 27 (24-31) |
†P < 0.01 all comparisons except MBPNP unilateral posterior + anterior (P adj. = 1), widespread pain (P adj. = 1) vs MBPNP bilateral posterior; MBPNP unilateral posterior + anterior vs widespread pain (P adj. = 1) |
Figures in Table 2: Class 1: MBPNP bilateral posterior—Pain sites on the dorsum of the body. Average pain intensity. Moderate to high activity limitation and psychological scores. Class 2: MBPNP unilateral posterior + anterior—Frontal and dorsal pain on upper extremities. Demographics and baseline scores are similar to subpopulation mean. Class 3: MBPNP unilateral posterior—Localized dorsal pain in upper extremities. Low activity limitation, pain intensity, and psychological scores. Class 4: Widespread pain—Multisite pain, whole body, frontal and dorsal. High activity limitation, pain intensity, and psychological scores.
χ2 test.
Kruskal–Wallis test.
Outliers = BMI < 7.5 or BMI > 105. In total, one individual was outlier and was excluded from the analysis, as we interpreted these as error in data.
BMI, body mass index; IQR, interquartile range; LCA, latent class analysis; MBPNP, midback/neck pain; P adj., P-value with Bonferroni correction.