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The roles of serum vitamin D and tobacco smoke exposure in insomnia: a cross-sectional study of adults in the United States.

Tianci Gao, Mengxing Hou, Qianfei Wang, Dong Liu, Fenqiao Chen et al.
Other Frontiers in nutrition 2023 3 citas
PubMed DOI CC-BY PDF
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Study Design

Tipo de estudio
Cross-sectional
Intervención
The roles of serum vitamin D and tobacco smoke exposure in insomnia: a cross-sectional study of adults in the United States. None
Comparador
Placebo
Dirección del efecto
Mixed
Riesgo de sesgo
Moderate

Abstract

AIM: Tobacco smoke exposure and vitamin D (VD) status were both associated with insomnia. However, the combined effect of smoking and VD on insomnia has not been discussed. This study aimed to explore the role of VD in the association between tobacco smoke exposure and insomnia. METHODS: Data on adults were extracted from the National Health and Nutrition Examination Surveys (NHANES) database in 2005-2008 for this cross-sectional study. Weighted univariate and multivariate logistic regression analyses were used to explore the associations between serum cotinine, serum VD, and insomnia. A surface diagram was drawn to reflect the effect of VD on the association between serum cotinine and insomnia. In addition, the potential regulating effect of VD in subgroups of smoking status was also performed. The evaluation index was odds ratios (ORs) with 95% confidence intervals (CIs). RESULTS: Among the eligible participants, 1,766 had insomnia. After adjusting for covariates, we found that elevated serum cotinine levels were associated with higher odds of insomnia [OR = 1.55, 95% CI: (1.22, 1.97)]. However, the relationship between serum VD level and insomnia was not significant (P = 0.553). Higher serum cotinine levels were also associated with higher odds of insomnia [OR = 1.52, 95% CI: (1.17, 1.98)] when serum VD level was <75 nmol/L; however, this relationship became non-significant when serum VD concentration was elevated (P = 0.088). Additionally, the potential regulating effect of VD was also found in adults who were not smoking. CONCLUSION: VD may play a potential regulative role in the association between tobacco smoke exposure and insomnia. Further studies are needed to clarify the causal relationships between VD, tobacco smoke exposure, and insomnia.

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Tables

Table 1

Variables Total (n = 6,312) Non-insomnia (n = 4,546) Insomnia (n = 1,766) Covariates screening
OR (95% CI) P
Age, years, mean ± SE45.04 (0.45)44.61 (0.45)46.08 (0.61)1.01 (1.00–1.01)0.005
Sex, n (%)
Male3,278 (50.80)2,479 (53.81)799 (43.37)Ref
Female3,034 (49.20)2,067 (46.19)967 (56.63)1.52 (1.35–1.72)< 0.001
Race, n (%)
Mexican American1,234 (8.42)966 (9.58)268 (5.56)Ref
Other hispanic454 (4.10)323 (4.05)131 (4.22)1.80 (1.33–2.43)< 0.001
Non-hispanic white3,033 (71.65)2,072 (69.70)961 (76.46)1.89 (1.57–2.28)< 0.001
Non-hispanic black1,363 (10.90)1,015 (11.32)348 (9.84)1.50 (1.22–1.84)< 0.001
Other races228 (4.93)170 (5.35)58 (3.92)1.27 (0.88–1.82)0.210
Education level, n (%)
Less than 9th grade728 (5.64)518 (5.72)210 (5.46)Ref
9–11th grade1,043 (12.26)730 (11.72)313 (13.60)1.22 (0.87–1.71)0.268
High school grad/GED or equivalent1,515 (24.40)1,049 (23.11)466 (27.59)1.25 (0.93–1.69)0.154
Some college or AA degree1,745 (30.85)1,271 (30.97)474 (30.55)1.03 (0.76–1.41)0.835
College graduate or above1,281 (26.85)978 (28.48)303 (22.80)0.84 (0.61–1.16)0.292
PIR, n (%)
≤ 11,159 (11.85)768 (10.84)391 (14.35)Ref
>15,153 (88.15)3,778 (89.16)1,375 (85.65)0.73 (0.60–0.87)0.002
Work status, n (%)
Working at a job or business3,958 (71.26)2,990 (74.23)968 (63.90)Ref
Not working at a job or business2,354 (28.74)1,556 (25.77)798 (36.10)1.63 (1.41–1.88)< 0.001
Work shift, n (%)
A regular daytime schedule2,958 (53.77)2,253 (56.60)705 (46.78)Ref
A regular evening/night shift357 (5.86)257 (5.70)100 (6.23)1.32 (1.05–1.67)0.026
A rotating shift297 (4.96)221 (5.17)76 (4.45)1.04 (0.72–1.51)0.835
Another schedule345 (6.65)258 (6.73)87 (6.44)1.16 (0.84–1.60)0.386
Unknown2,355 (28.76)1,557 (25.80)798 (36.10)1.69 (1.46–1.96)< 0.001
BMI, kg/m2, n (%)
≤ 251,827 (31.69)1,339 (32.25)488 (30.30)Ref
>254,485 (68.31)3,207 (67.75)1,278 (69.70)1.10 (0.98–1.23)0.125
Physical activity, MET min/week, n (%)
≤ 450899 (15.34)669 (15.93)230 (13.89)Ref
>4503,425 (58.19)2,476 (58.20)949 (58.18)1.15 (0.94–1.40)0.191
Unknown1,988 (26.47)1,401 (25.87)587 (27.93)1.24 (0.99–1.54)0.066
Drinking, n (%)
No1,829 (24.28)1,336 (24.55)493 (23.63)Ref
Yes4,483 (75.72)3,210 (75.45)1,273 (76.37)1.05 (0.93–1.19)0.450
Smoking, n (%)
No4,877 (76.28)3,612 (78.30)1,265 (71.29)Ref
Yes1,435 (23.72)934 (21.70)501 (28.71)1.45 (1.24–1.71)< 0.001
Hypertension, n (%)
No2,949 (51.08)2,228 (53.36)721 (45.43)Ref
Yes3,363 (48.92)2,318 (46.64)1,045 (54.57)1.37 (1.14–1.66)0.002
DM, n (%)
No4,877 (76.28)3,612 (78.30)1,265 (71.29)Ref
Yes1,435 (23.72)934 (21.70)501 (28.71)1.25 (1.07–1.45)0.008
Dyslipidemia, n (%)
No1,660 (27.48)1,236 (28.91)424 (23.95)Ref
Yes4,652 (72.52)3,310 (71.09)1,342 (76.05)1.29 (1.10–1.51)0.004
Depression, n (%)
No5,504 (86.50)4,120 (89.59)1,384 (78.87)Ref
Yes808 (13.50)426 (10.41)382 (21.13)2.31 (1.93–2.76)< 0.001
OSA, n (%)
 No3,117 (49.21)2,319 (50.42)798 (46.20)Ref
 Yes3,195 (50.79)2,227 (49.58)968 (53.80)1.18 (1.06–1.33)0.007
CRP, mg/dL, Mean ± SE0.40 (0.01)0.37 (0.01)0.46 (0.03)1.14 (1.06–1.22)0.002
Total energy intake, Kcal, mean ± SE2,251.75 (21.49)2,273.64 (19.37)2,197.62 (41.65)1.00 (1.00–1.00)0.069
Caffeine intake, mg, mean ± SE197.25 (6.75)193.67 (6.77)206.10 (10.79)1.00 (1.00–1.00)0.211
HEI−2015, mean ± SE49.52 (0.38)49.72 (0.40)49.02 (0.53)1.00 (0.99–1.00)0.159
VD collection season, n (%)
November 1 to April 302,879 (39.48)2,138 (40.62)741 (36.68)Ref
May 1 to October 313,433 (60.52)2,408 (59.38)1,025 (63.32)1.18 (1.02–1.36)0.031
Blood collection time, n (%)
Morning3,051 (48.52)2,201 (48.64)850 (48.22)Ref
Afternoon2,297 (34.01)1,633 (33.26)664 (35.85)1.09 (0.96–1.23)0.205
Evening964 (17.47)712 (18.10)252 (15.93)0.89 (0.71–1.11)0.302
Cotinine, ng/mL, n (%)
< 0.052,754 (43.39)2,068 (45.03)686 (39.32)Ref
0.05–2.991,743 (27.03)1,288 (27.81)455 (25.08)1.03 (0.85–1.25)0.745
≥3.001,815 (29.58)1,190 (27.16)625 (35.60)1.50 (1.24–1.81)< 0.001
VD, nmol/L, n (%)
< 755,079 (73.81)3,671 (73.99)1,408 (73.37)Ref
≥751,233 (26.19)875 (26.01)358 (26.63)1.03 (0.90–1.19)0.657

Table 2

Variables Model 1 Model 2
OR (95% CI) P OR (95% CI) P
Cotinine, ng/mL< 0.05RefRef
0.05–2.991.03 (0.85–1.25)0.7451.06 (0.87–1.29)0.599
≥3.001.50 (1.24–1.81)< 0.0011.55 (1.22–1.97)0.006
VD, nmol/L< 75RefRef
≥751.03 (0.90–1.19)0.6570.95 (0.80–1.12)0.553

Table 3

Serum VD levels, nmol/L Serum cotinine levels, ng/mL Model 1 Model 2
OR (95% CI) P OR (95% CI) P
< 75< 0.05Ref
0.05–2.991.01 (0.83–1.23)0.9421.03 (0.83–1.27)0.821
≥3.001.55 (1.22–1.98)0.0011.52 (1.17–1.98)0.011
≥75< 0.05Ref
0.05–2.991.13 (0.72–1.75)0.6041.15 (0.74–1.80)0.545
≥3.001.38 (1.00–1.91)0.0631.75 (1.00–3.07)0.088

Table 4

Serum VD levels, nmol/L Serum cotinine levels, ng/mL Non-smoking Smoking
OR (95% CI) P OR (95% CI) P
< 75< 0.05RefRef
0.05–2.991.06 (0.86–1.31)0.5880.36 (0.08–1.69)0.221
≥3.001.62 (1.23–2.12)0.0050.77 (0.20–2.94)0.715
≥75< 0.05Ref
0.05–2.991.16 (0.74–1.82)0.528
≥3.001.53 (0.86–2.70)0.180

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