Biofilm formation on polystyrene, growth rate, and susceptibility to oxidative stress among 98 clinical and environmental S. maltophilia strains. A. Biofilm levels (mean + SD) formed by CF, non-CF, and ENV (ENV-37: 37°C-grown strains; ENV-25: 25°C-grown strains) isolates. B. Biofilm formation normalized on mean generation time (MGT) by CF, non-CF, ENV-37, and ENV-25 isolates. C. Percentage distribution of non-CF (blue bars) and CF (cyan bars) isolates belonging to no (OD492 ≤ 0.096; n = 5), weak (0.096 < OD492 ≤ 0.192; n = 6), moderate (0.192 < OD492 ≤ 0.384; n = 11), or strong (OD492 > 0.384; n = 66) biofilm producer group. D. Biofilm formation (mean + SD) observed in non-CF strains, stratified by the isolation site, and CF strains. E. Mean generation time (mean + SD) of CF, non-CF, ENV-37, and ENV-25 isolates. F. Sensitivity to oxidative stress of CF, non-CF, ENV-37, and ENV-25 isolates. Results are expressed as mean (+ SD) diameter of inhibition zone formed by each isolate following exposure to 1.5% (vol/vol) H2O2. * p < 0.05 or ** p < 0.01, ANOVA followed by Bonferroni's multiple comparison post-test. ° p < 0.05 or °°° p < 0.0001, Fisher's exact test.