Age, Gender and Season Are Good Predictors of Vitamin D Status Independent of Body Mass Index in Office Workers in a Subtropical Region
Abstract
:1. Introduction
2. Methods
2.1. Study Population
2.2. Study Parameters and Definitions
2.3. Subject Selection
2.4. Blood Collection and Determination of Serum 25(OH)D Levels
2.5. Blood Collection and Determination of Total Serum Calcium, Phosphate, Creatinine and Albumin
2.6. Statistical Analysis
3. Results
3.1. Demographic and Anthropometric Characteristics of the Study Population
3.2. Distribution of Serum Vitamin D among Indoor Office Workers
3.3. Associations of Risks of Hypovitaminosis D with Gender, Age, Season, and Body-Mass Index
3.4. Subgroup Analysis by Genders for Predictors of Hypovitaminosis D
3.5. Associations between Hypovitaminosis D and Corrected Total Serum Calcium Concentrations
4. Discussion
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
Data Availability
Abbreviations
AUC | Area under the receiver operating characteristic curve |
25(OH)D | 25-hydroxyvitamin D |
BMI | Body mass index |
ELISA | Enzyme linked immunosorbent assay |
ICD-9 | International Classification of Diseases, Ninth Revision, Clinical Modification |
ROC | Curve a receiver operating characteristic curve |
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Total (n = 2880) | Female (n = 1440) | Male (n = 1440) | p | |
---|---|---|---|---|
Age, mean (SD), years | 46 (11) | 46 (11) | 46 (11) | 1.0 |
BMI, mean (SD) | 24 (4) | 22 (4) | 25 (4) | 0.75 |
Vitamin D status, n (%) | ||||
Optimal (≥30 ng/mL) | 1098 (38.1) | 405 (28.1) | 693 (48.1) | <0.001 |
Hypovitaminosis D (<30 ng/mL) | 1782 (61.9) | 1035 (71.9) | 747 (51.9) | |
25(OH)D, mean (SD), ng/mL | 29 (9) | 26 (8) | 31 (10) | <0.001 |
25(OH)D in age groups, mean (SD), ng/mL, n | ||||
26–35 years | 26 (7), 720 | 23 (7), 360 | 28 (7), 360 | <0.001 |
36–45 years | 27 (8), 720 | 25 (7), 360 | 29 (9), 360 | <0.001 |
46–55 years | 30 (9), 720 | 28 (8), 360 | 31 (9), 360 | <0.001 |
56–65 years | 33 (10), 720 | 30 (8), 360 | 35 (12), 360 | <0.001 |
25(OH)D in seasons, mean (SD), ng/mL, n | ||||
Shorter daylight (Winter/Spring) | 28 (9), 1440 | 26 (7), 720 | 30 (10), 720 | <0.001 |
Longer daylight (Summer/Autumn) | 30 (9), 1440 | 27 (7), 720 | 32 (10), 720 | <0.001 |
25(OH)D in BMI groups, mean (SD), ng/mL, n | ||||
Obese (≥30.0) | 28 (9), 203 | 27 (8), 57 | 28 (9), 146 | 0.63 |
Overweight (25 ≤ BMI < 30) | 29 (9), 741 | 28 (8), 239 | 30 (9), 502 | 0.01 |
Normal (20 ≤ BMI < 25) | 29 (10), 1431 | 26 (8), 741 | 31 (10), 690 | <0.001 |
Under weight (<20.0) | 27 (8), 505 | 26 (8), 403 | 32 (10), 102 | <0.001 |
Corrected total serum calcium concentration, mean (SD), mg/ml | 8 (1) | 8 (0) | 8 (1) | 0.33 |
Serumphosphate concentration, mg/ml | 7 (2) | 7 (2) | 7 (2) | 0.19 |
eGFR | 83 (15) | 85 (14) | 82 (15) | 0.65 |
Vitamin D Status | Hypovitaminosis D (<30 ng/mL), n = 1782 (61.9%), n (%) | Optimal (≥30 ng/mL), n = 1098 (38.1%), n (%) | Crude OR (95% CI) | Adjusted OR (95% CI) |
---|---|---|---|---|
Gender | ||||
Female (n = 1440) | 1035 (71.9) | 405 (28.1) | 2.37 (2.03, 2.77) | 2.33 (1.75, 3.09) * |
Male (n = 1440) | 747 (52.7) | 693 (47.3) | 1.0 | 1.0 |
Age group, years | ||||
26–35 (n = 720) | 543 (75.4) | 177 (24.6) | 3.65 (2.91, 4.56) | 4.32 (2.98, 6.24) * |
36–45 (n = 720) | 506 (70.3) | 214 (29.7) | 2.81 (2.26, 3.49) | 2.82 (1.93, 4.12) * |
46–55 (n = 720) | 404 (56.1) | 316 (43.9) | 1.52 (1.23, 1.87) | 1.50 (1.03, 2.17) * |
56–65 (n = 720) | 329 (45.7) | 391 (54.3) | 1.0 | 1.0 |
Season | ||||
(Winter/Spring) (n = 1440) | 952 (66.1) | 488 (33.9) | 1.43 (1.23, 1.67) | 1.55 (1.08, 2.22) * |
(Summer/Autumn) (n = 1440) | 830 (57.6) | 610 (42.4) | 1.0 | 1.0 |
BMI (kg/m2) | ||||
Obese (≥30.0) | 133 (65.5) | 70 (34.5) | 1.17 (0.86, 1.59) | |
Overweight (25 ≤ BMI < 30) | 427 (57.6) | 314 (42.4) | 0.84 (0.70, 1.00) | |
Normal (20 ≤ BMI < 25) | 886 (61.9) | 545 (38.1) | 1.0 | |
Under weight (<20.0) | 336 (66.5) | 169 (33.5) | 1.22 (0.99, 1.51) |
Females | (n = 1440) | |||
---|---|---|---|---|
Vitamin D Status | Hypovitaminosis D, n = 1035, n (%) | Optimal, n = 405, n (%) | Crude OR (95% CI) | Adjusted OR (95% CI) |
Age group, years | ||||
26–35 (n = 360) | 308 (86.1) | 52 (13.9) | 4.74 (3.31, 6.79) | 4.05 * (2.35, 6.98) |
36–45 (n = 360) | 292 (81.1) | 68 (18.9) | 3.44 (2.46, 4.81) | 3.22 * (1.81, 5.71) |
46–55 (n = 360) | 235 (65.3) | 125 (34.7) | 1.50 (1.11, 2.03) | 1.67 (1.00, 2.80) |
56–65 (n = 360) | 200 (55.6) | 160 (44.4) | 1.0 | 1.0 |
Season | ||||
(Winter/Spring) (n = 720) | 538 (74.7) | 182 (25.3) | 1.33 (1.05, 1.67) | 1.12 (0.78, 1.62) |
(Summer/Autumn) (n = 720) | 497 (69.0) | 223 (31.0) | 1.0 | 1.0 |
BMI (kg/m2), n (%) | ||||
Obese (≥30.0) | 39 (68.4) | 18 (31.6) | 0.84 (0.47, 1.50) | |
Overweight (25 ≤ BMI < 30) | 169 (70.7) | 70 (29.3) | 0.94 (0.68, 1.29) | |
Normal (20 ≤ BMI < 25) | 534 (72.1) | 207 (27.9) | 1.0 | |
Under weight (<20.0) | 293 (72.7) | 110 (27.3) | 1.0 (0.79,1.35) |
Males | (n = 1440) | |||
---|---|---|---|---|
Vitamin D Status | Hypovitaminosis D, n = 747, n (%) | Optimal, n = 693, n (%) | Crude OR (95% CI) | Adjusted OR (95% CI) |
Age group, years | ||||
26–35 (n = 360) | 235 (65.8) | 125 (34.2) | 3.37 (2.48, 4.57) | 4.73 * (2.76, 8.09) |
36–45 (n = 360) | 214 (60.6) | 146 (39.4) | 2.62 (1.94, 3.55) | 2.30 * (1.34, 3.92) |
46–55 (n = 360) | 169 (47.5) | 191 (52.5) | 1.58 (1.18, 2.14) | 1.22 (0.70, 2.13) |
56–65 (n = 360) | 129 (36.9) | 231 (63.1) | 1.0 | 1.0 |
Season | ||||
(Winter/Spring) (n = 720) | 414 (57.5) | 306 (42.5) | 1.57 (1.28, 1.94) | 1.99 * (1.40, 2.83) |
(Summer/Autumn) (n = 720) | 333 (46.2) | 387 (53.8) | 1.0 | 1.0 |
BMI (kg/m2), n (%) | ||||
Obese (≥30.0) | 94 (64.4) | 52 (35.6) | 1.74 (1.20, 2.51) | 1.27 (0.89, 1.94) |
Overweight (2530) | 258 (51.4) | 244 (48.6) | 1.02 (0.81, 1.28) | 1.06 (0.85, 1.23) |
Normal (20 ≤ BMI < 25) | 352 (51.0) | 338 (49.0) | 1.0 | 1.0 |
Under weight (<20.0) | 43 (42.2) | 59 (57.8) | 0.70 (0.46, 1.07) | 0.78 (0.57, 1.10) |
Corrected Total Serum Calcium Status * | Hypocalcemia (<8.4 mg/mL) (n = 1413) | Normal Calcium Levels (8.4~10.4 mg/mL) (n = 1467) | p | Calcium Levels Mean (SD), mg/mL |
---|---|---|---|---|
Vitamin D status (serum 25(OH)D concentrations), n (%) | <0.001 | |||
Deficiency (<20 ng/mL) (n = 408) | 214 (15.1) | 194 (13.2) | 8.39 (0.41) | |
Insufficiency (20–29.9 ng/mL) (n = 1374) | 716 (50.7) | 658 (44.9) | 8.39 (0.40) | |
Optimal (≥30 ng/mL) (n = 1098) | 483 (34.2) | 615 (41.9) | 8.47 (0.39) |
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Share and Cite
Wang, L.-K.; Hung, K.-C.; Lin, Y.-T.; Chang, Y.-J.; Wu, Z.-F.; Ho, C.-H.; Chen, J.-Y. Age, Gender and Season Are Good Predictors of Vitamin D Status Independent of Body Mass Index in Office Workers in a Subtropical Region. Nutrients 2020, 12, 2719. https://doi.org/10.3390/nu12092719
Wang L-K, Hung K-C, Lin Y-T, Chang Y-J, Wu Z-F, Ho C-H, Chen J-Y. Age, Gender and Season Are Good Predictors of Vitamin D Status Independent of Body Mass Index in Office Workers in a Subtropical Region. Nutrients. 2020; 12(9):2719. https://doi.org/10.3390/nu12092719
Chicago/Turabian StyleWang, Li-Kai, Kuo-Chuan Hung, Yao-Tsung Lin, Ying-Jen Chang, Zhi-Fu Wu, Chung-Han Ho, and Jen-Yin Chen. 2020. "Age, Gender and Season Are Good Predictors of Vitamin D Status Independent of Body Mass Index in Office Workers in a Subtropical Region" Nutrients 12, no. 9: 2719. https://doi.org/10.3390/nu12092719