Table 2: Demographics of the subjects with no evidence of infection.

CharacteristicSonicate fluid culture value
Positive (≥20 cfu/10 mL)
Negative (<20 cfu/10 mL)

Number of breast tissue expanders (number of subjects)52 (39)269 (166)
Subject age (years) (median [range])45 (23–77)52 (18–77)<0.0001
Breast tissue expander age (months) (median [range])10 (1–29)11 (2–218)0.5221
Breast tissue expander surface1.00
 Smooth110
 Textured 47257
Saline expansions at Mayo Clinic Rochester ( )33176
 Total number of expansions (median [range])7 (1–15)8 (0–20)0.0175
 Time since first expansion (days) (median [range])298 (37–1127)320 (43–2684)0.2865
 Time since last expansion (days) (median [range])175 (29–1222)172 (1–2588)0.364
Number of breasts with radiotherapy treatment2540.0026
Underlying condition (%)0.1742
 Breast cancer25 (48.1)151 (56.1)
 Prophylaxis23 (44.2)114 (42.4)
 Other4 (7.7)4 (1.5)