TABLE 1.
Demographics, semen parameters, and job characteristics of working men in the SFF study sample (N = 680)
| Mean | Std Dev | N | % | |
|---|---|---|---|---|
| Age (years) | 31.7 | 6.1 | ||
| Body Mass Index (kg/m2) | 28.4 | 5.2 | ||
| Duration of abstinence (hours) | 77.8 | 31.2 | ||
| Race/Ethnicity | ||||
| White | 509 | 74.9 | ||
| Hispanic | 97 | 14.3 | ||
| Black | 43 | 6.3 | ||
| Asian/Other | 31 | 4.6 | ||
| Education | ||||
| High school or less | 258 | 38.0 | ||
| Beyond high school | 419 | 61.6 | ||
| Missing | 3 | 0.4 | ||
| Tobacco smoking | ||||
| No | 548 | 81.1 | ||
| Yes | 128 | 18.9 | ||
| Missing | ||||
| Alcohol use | ||||
| No | 279 | 41.0 | ||
| Yes | 400 | 58.9 | ||
| Missing | 1 | 0.1 | ||
| Recent fever | ||||
| No | 658 | 96.8 | ||
| Yes | 22 | 3.2 | ||
| Missing | 0 | 0 | ||
| History of STD | ||||
| No | 598 | 87.9 | ||
| Yes | 82 | 12.1 | ||
| Missing | 0 | 0 | ||
| Recreational drug use | ||||
| No | 618 | 90.9 | ||
| Yes | 60 | 8.8 | ||
| Missing | 2 | 0.3 | ||
| Total Sperm Count (106) (IQR) | 260.4 | 111.8 – 349.1 | ||
| Sperm Concentration (106/mL) (IQR) | 79.6 | 38.7 – 104.1 | ||
| Motility (%) | 51.0 | 11.5 | ||
| Morphology (WHO 1999 criteria) % normal | 10.8 | 5.1 | ||
| Major occupational category (Major SOC code) | ||||
| Management, Business, and Financial (11–13) | 113 | 16.6 | ||
| Computer, Engineering, and Science (15–19) | 103 | 15.2 | ||
| Education, Legal, Community Service (21–25) | 78 | 11.5 | ||
| Healthcare Practitioners, Technical & Support Occupations (29–31) | 51 | 7.5 | ||
| Transportation & Material Moving (53) | 50 | 7.4 | ||
| Office and Administrative Support (43) | 43 | 6.3 | ||
| Production (51) | 38 | 5.6 | ||
| Sales and Related (41) | 37 | 5.4 | ||
| Installation, Maintenance, and Repair (49) | 36 | 5.3 | ||
| Construction and Extraction (47) | 33 | 4.9 | ||
| Food Preparation and Serving-related (35) | 32 | 4.7 | ||
| Arts, Design, Entertainment, Sports, and Media (27) | 32 | 4.7 | ||
| Protective Services (33) | 15 | 2.2 | ||
| Building and Grounds Cleaning and Maintenance (37) | 13 | 1.9 | ||
| Personal Care and Service (39) | 3 | 0.4 | ||
| Farming, Fishing, and Forestry (45) | 1 | 0.1 | ||
| Military-specific (55) | 1 | 0.1 | ||
| Self-reported exposures at work | ||||
| Exposed to lead at work: | ||||
| Current (in past 3 months) | 7 | 1.1 | ||
| Current and Past (ongoing > 3 months) | 15 | 2.4 | ||
| Past only (>3 months ago) | 12 | 1.9 | ||
| Unexposed | 586 | 94.5 | ||
| Exposed to solvents at work: | ||||
| Current (in past 3 months) | 30 | 4.5 | ||
| Current and Past (ongoing > 3 months) | 86 | 12.8 | ||
| Past only (>3 months ago) | 89 | 13.2 | ||
| Unexposed | 467 | 69.5 | ||
| Exposed to pesticides/herbicides at work: | ||||
| Current (in past 3 months) | 9 | 1.3 | ||
| Current and Past (ongoing > 3 months) | 22 | 3.3 | ||
| Past only (>3 months ago) | 65 | 9.6 | ||
| Unexposed | 578 | 85.8 | ||
| Exposed to radiation at work: | ||||
| Current (in past 3 months) | 6 | 0.9 | ||
| Current and Past (ongoing > 3 months) | 14 | 2.1 | ||
| Past only (>3 months ago) | 22 | 3.3 | ||
| Unexposed | 632 | 93.8 | ||
| Physical Activity Level (by O*NET scoring) | ||||
| Low | 391 | 58.8 | ||
| Medium | 156 | 23.5 | ||
| High | 118 | 17.3 | ||