Table 1. Characteristics of the cohort based on circumcision statusa,b.
| Unmatched | Matched | |||||
|---|---|---|---|---|---|---|
| Circumcised | Non-circumcised | p-value | Circumcised | Non-circumcised | p-value | |
| No. of subject | 2,334 | 573 | 944 | 472 | ||
| Age (y) | 32.5±6.3 | 33.7±7.4 | <0.01 | 33.5±6.5 | 33.5±7.3 | 0.95 |
| Race/ethnicity | <0.01 | 0.05 | ||||
| White | 1,897 (81.3) | 316 (55.2) | 632 (69.9) | 293 (62.1) | ||
| Black | 205 (8.8) | 63 (11.0) | 102 (10.8) | 46 (9.7) | ||
| Other | 232 (9.9) | 194 (33.9) | 210 (22.2) | 133 (28.2) | ||
| Length of stay (newborn) (d) | <0.01 | 0.96 | ||||
| 1 | 572 (24.5) | 193 (33.7) | 296 (31.4) | 145 (30.7) | ||
| 2 | 1,159 (49.7) | 182 (31.8) | 332 (35.2) | 162 (34.3) | ||
| 3 | 388 (16.6) | 99 (17.3) | 169 (17.9) | 89 (18.9) | ||
| ≥4 | 215 (9.2) | 99 (17.3) | 147 (15.6) | 76 (16.1) | ||
| Delivery | <0.01 | 0.84 | ||||
| Vaginal | 1,632 (71.6) | 347 (63.7) | 615 (65.1) | 305 (64.6) | ||
| Caesarean section | 646 (28.4) | 198 (36.3) | 329 (34.9) | 167 (35.4) | ||
| Employee type | 0.48 | 0.42 | ||||
| Salary | 913 (39.1) | 215 (37.5) | 359 (38.0) | 190 (40.3) | ||
| Hourly | 1,421 (60.9) | 358 (62.5) | 585 (62.0) | 282 (59.7) | ||
| Region | <0.01 | 0.12 | ||||
| Northeast/MidAtlantic | 403 (17.3) | 101 (17.6) | 166 (17.6) | 87 (18.4) | ||
| East North Central | 674 (28.9) | 108 (18.9) | 215 (22.8) | 98 (20.8) | ||
| West North Central | 158 (6.8) | 40 (7.0) | 65 (6.9) | 39 (8.3) | ||
| South Atlantic | 260 (11.1) | 55 (9.6) | 91 (9.6) | 26 (5.5) | ||
| East South Central | 262 (11.2) | 59 (10.3) | 123 (13.0) | 56 (11.9) | ||
| West South Central | 377 (16.2) | 119 (20.8) | 184 (19.5) | 106 (22.5) | ||
| West | 112 (4.8) | 22 (3.8) | 30 (3.2) | 21 (4.4) | ||
| Pacific | 88 (3.8) | 69 (12.0) | 70 (7.4) | 39 (8.3) | ||
| Year of birth | <0.01 | 0.05 | ||||
| 2003–2004 | 728 (31.2) | 154 (26.9) | 292 (30.9) | 132 (28.0) | ||
| 2005–2006 | 589 (25.2) | 143 (25.0) | 223 (23.6) | 120 (25.4) | ||
| 2007–2008 | 508 (21.8) | 126 (22.0) | 207 (21.9) | 103 (21.8) | ||
| 2009–2010 | 268 (11.5) | 57 (9.9) | 119 (12.6) | 44 (9.3) | ||
| 2011–2012 | 241 (10.3) | 93 (16.2) | 103 (10.9) | 73 (15.5) | ||
Values are presented as mean±standard deviation or number (%).
aUnmatched and propensity matched cohorts are listed. p-values represent chi squared test for categorical variables (race/ethnicity, delivery, employee type, region) and ANOVA for continuous variables (age, length of stay). bIndividual totals vary based on missing data for covariates.