Table 1.
Demographic characteristics of study sample stratified by history of employment as a firefighter (n = 164).
| Characteristic | Firefighting Status, n (%) | p-Value | |||
|---|---|---|---|---|---|
| Firefighter, | Non-Firefighter, | ||||
| 106 (64.6) | 58 (35.4) | ||||
| Mean ± SD, [Range] | |||||
| Age, years | 38 ± 7.2, [20, 55] | 35.3 ± 6.6, [20, 54] | 0.02 | ||
| Perceived stress a | 15.6 ± 6.9, [3, 34] | 13.4 ± 6.1, [0, 27] | 0.04 | ||
| BMI, kg/m2 | 26.3 ± 4.5, [17.7, 42.9] | 25.8 ± 5.2, [17.5, 38.7] | 0.55 | ||
| Number of known pregnancies | 1.2 ± 1.5, [0, 6] | 1.6 ± 1.8, [0, 6] | 0.18 | ||
| Number of biological children | 0.8 ± 1.0, [0, 5] | 1.2 ± 1.3, [0, 5] | 0.15 | ||
| nb (%) | |||||
| BMI, kg/m2 | 0.13 | ||||
| BMI < 18.5 | <5 | <5 | |||
| 18.5 ≤ BMI < 25 | 41 | (38.7) | 30 | (51.7) | |
| 25 ≤ BMI < 30 | 47 | (44.3) | 15 | (25.9) | |
| BMI ≥ 30 | 16 | (15.1) | 11 | (19.0) | |
| Race | 0.17 | ||||
| White | 101 | (95.3) | 56 | (96.6) | |
| Ethnicity | 0.88 | ||||
| Hispanic | 8 | (7.5) | <5 | ||
| Annual household income | 0.24 | ||||
| USD 50,000 or less | 11 | (10.4) | 8 | (13.8) | |
| USD 50,001–75,000 | 20 | (18.9) | 5 | (8.8) | |
| USD 75,001–100,000 | 19 | (17.9) | 12 | (21.1) | |
| More than USD 100,000 | 56 | (52.8) | 33 | (56.1) | |
| Highest educational attainment | 0.003 | ||||
| High school graduate or GED, some college, or technical school | 46 | (43.4) | 11 | (19.0) | |
| College graduate (4-year degree) | 43 | (40.6) | 27 | (46.6) | |
| Advanced degree (graduate or professional) | 17 | (16.0) | 20 | (34.5) | |
| Marital status | 0.30 | ||||
| Married or in a registered domestic partnership or civil union | 59 | (55.7) | 41 | (66.7) | |
| Never married | 27 | (25.5) | 12 | (21.1) | |
| Divorced or separated | 19 | (17.9) | 5 | (7.0) | |
| Current exercise habits | 0.001 | ||||
| 1: Sedentary | <5 | <5 | |||
| 2 | <5 | 6 | (10.3) | ||
| 3 | 31 | (29.2) | 27 | (39.7) | |
| 4 | 45 | (42.5) | 19 | (32.8) | |
| 5: Very strenuous | 27 | (25.5) | <5 | ||
| Age at menarche | 0.41 | ||||
| ≤11 | 26 | (24.5) | 8 | (13.8) | |
| 12 | 28 | (26.4) | 17 | (29.3) | |
| 13 | 21 | (19.8) | 17 | (29.3) | |
| ≥14 | 31 | (29.2) | 16 | (27.6) | |
| History of infertility | 19 | (17.9) | <5 | 0.05 | |
| Ever used fertility treatment | 13 | (12.3) | 7 | (12.1) | 0.97 |
| Ever used hormonal contraceptives | |||||
| Oral contraceptives | 85 | (80.2) | 48 | (82.8) | 0.69 |
| Other hormonal contraceptive (implant, injectable, patch, ring) | 32 | (30.2) | 15 | (25.9) | 0.56 |
| Currently using hormonal contraceptives | |||||
| Oral contraceptives | 13 | (12.3) | 6 | (10.3) | 0.71 |
| Other hormonal contraceptive (implant, injectable, patch, ring) | <5 | <5 | 0.83 | ||
| Endometriosis history | 8 | (7.5) | <5 | 0.58 | |
| History of polycystic ovary syndrome | 6 | (5.6) | <5 | 0.53 | |
a Measured with the PSS-10 (10 Question Perceived Stress Scale). Cells with less than five participants have been censored to ensure participant privacy. b Cells with less than five participants have been censored to ensure participant privacy.