Observational Study
Copyright ©The Author(s) 2025.
World J Clin Cases. Jun 16, 2025; 13(17): 103920
Published online Jun 16, 2025. doi: 10.12998/wjcc.v13.i17.103920
Table 1 Korean standard classification of diseases by selected disease
Disease
Korean standard classification of diseases
Neck painM25.68, M50.1, M50.8, M50.9, M54.2, S13.4, U30.3
Shoulder painM13.91, M19.21, M19.81, M19.91, M24.21, M24.51, M24.61, M24.81, M24.91, M25.51, M25.61, M25.81, M25.91, M62.61, M75.0, M75.1, M75.2, M75.3, M75.4, M75.5, M75.8, M75.9, M79.11, M79.21, S40.0, S43.4, S43.5, S43.6, S43.7
Table 2 Demographics and main outcome variables, n (%)

Neck pain (non-applications)
Neck pain (applications)
Shoulder pain (non-applications)
Shoulder pain (applications)
Age (years) (average)46.3 ± 12.350.1 ± 15.954.5 ± 12.850.3 ± 14.5
Age (years) (minimum)26273022
Age (years) (maximum)67798178
Male13 (37.1)12 (40)16 (39.0)14 (45.2)
Female22 (62.9)18 (60)25 (61.0)17 (54.8)
Participants35 (53.8)30 (46.2)41 (56.9)31 (43.1)
Completed28 (93.3)30 (96.8)
Incomplete2 (6.7)1 (3.2)
Table 3 Korean standard classification of diseases status by selected diseases, n (%)
Neck pain
Shoulder pain
KCD code
Non-applications (n = 35)
Applications (n = 30)
KCD code
Non-applications (n = 41)
Applications (n = 31)
M54.2223 (65.7)20 (66.7)M75.824 (58.5)12 (38.7)
S13.49 (25.7)8 (26.7)M79.1188 (19.5)10 (32.3)
M50.12 (5.7)0S43.44 (9.8)4 (12.9)
M54.201 (2.9)0M25.512 (4.9)0
M25.6801 (3.3)M24.911 (2.4)0
M50.901 (3.3)M75.01 (2.4)1 (3.2)
M79.1101 (2.4)0
M62.6103 (9.7)
M13.9101 (3.2)
Table 4 Auxiliary variable after correcting for confounding variables
Neck pain
Shoulder pain
Number of visits
Total medical expenses
NRS change
Number of visits
Total medical expenses
NRS change
Sex (reference male)0.05 ± 0.650.37 ± 0.32-0.79 ± 0.66-0.08 ± 0.33-0.14 ± 0.281.51 ± 0.48b
Age (years) (reference under 65)0.26 ± 0.300.16 ± 0.350.35 ± 0.930.01 ± 0.41-0.22 ± 0.41-0.70 ± 0.62
Symptom intensity (NRS)0.01 ± 0.070.03 ± 0.08-0.33 ± 0.190.02 ± 0.08-0.04 ± 0.07-0.61 ± 0.14b
Severity0.17 ± 0.470.06 ± 0.531.45 ± 1.292.11 ± 0.45b1.16 ± 0.46b2.11 ± 1.21
Groups-0.30 ± 0.25-0.10 ± 0.27-1.74 ± 0.64b-1.52 ± 0.45b-0.61 ± 0.31-0.44 ± 0.49
Intercept1.41 ± 0.6511.25 ± 0.88c4.21 ± 1.86b1.48 ± 0.44b12.36 ± 0.36b0.97 ± 0.71
Table 5 Corresponding sample test of neck disability index and University of California-Los Angeles scale change
Average
SD
SE of the mean
95%CI of difference
(lower limit)
95%CI of difference (upper limit)
t test
Degree of Freedom
P value (double-tail)

Neck disability index change10.3055610.903072.569884.8835815.727534.010170.001
University of California-Los Angeles change-1.809523.325940.72578-3.32348-0.29557-2.493200.022