CRP and infection: However, patients who developed a secondary infection stayed 3.6- to 4.1-fold longer in hospital (33 [27–43] vs 8 [5–12] days; p < 0.0001) and ICUs (29 [20–36] vs 8 [5–10] days; p < 0.0001) and had lower CRP levels (75 [27–144] vs 164 [130–194] mg/L; p = 0.003) than patients who did not develop a secondary infection (Table 2).