Table 1.
Participants’ baseline characteristics (N = 365).
| Variable | Total | Ab Titer at 6 Months, Median (IQR), U/mL |
Correlation Coefficient ρ | p-Value |
|---|---|---|---|---|
| Age, median (IQR), y | 44 (32–54) | −0.347 | <0.0001 # | |
| Sex (M/F), n | 115/250 | 482 (305 to 865)/572 (316 to 884) | 0.1970 * | |
| Body mass index, median (IQR), kg/m2 | 22.4 (20.2–24.8) | −0.017 | 0.7446 # | |
| Smoking (ever/never), n | 149/216 | 406 (213 to 688)/614 (405 to 957) | <0.0001 * | |
| Current smoker/ex-smoker/unknown | 90/45/14 | 354 (174 to 564)/436 (225 to 894) §§ | 0.0609 * | |
| ex-smoker vs. never-smoker | 0.0014 * | |||
| current smoker vs. never-smoker | <0.0001 * | |||
| Brinkman Index §§, §§§, n | 129 | −0.197 | 0.0258 # | |
| Drinking, n | 228/134/3 § | 544 (299 to 881)/536 (348 to 868) §§ | 0.7697 * | |
| Allergy, n | ||||
| Food | 38/292/35 § | 515 (307 to 925)/544 (318 to 807) §§ | 0.7697 * | |
| Drug | 37/293/35 § | 517 (287 to 759)/549 (321 to 833) §§ | 0.5858 * | |
| Allergic disease, n | ||||
| Allergic rhinitis including pollinosis | 167/175/23 § | 546 (258 to 895)/523 (320 to 792) §§ | 0.8242 * | |
| Bronchial asthma | 43/299/23 § | 582 (360 to 885)/522 304 to 837) §§ | 0.5643 * | |
| Skin allergy including atopic dermatitis | 47/295/23 § | 641(380 to 1005)/522(303 to 815) §§ | 0.0710 * | |
| Diabetes mellitus, n | 12/340/13 § | 331 (149 to 589)/540 (318 to878) §§ | 0.0512 * | |
| Hypertension, n | 27/325/13 § | 356 (195 to 566)/553 (321to 872) §§ | 0.0327 * | |
| Dyslipidemia, n | 18/334/13 § | 351 (205to 698)/544 (317 to 877) §§ | 0.0834 * | |
| Collagen disease, n | 13/332/20 § | 303 (126 to 840)/544 (324 to 843) §§ | 0.2695 * |
IQR = interquartile range. *: Mann–Whitney U test. #: Spearman’s rank correlation coefficient test. §: yes/no/unknown are shown. §§: unknown is excluded. §§§: ever-smoker only.