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Table 1 Means, minimum, and maximum of particulate matter (PM100 [μg/m3]) and microbial levels (cell equivalents/m3) in infant breathing zone (IBZ) versus adult breathing zone (ABZ) during both five individual crawling and walking experiments on different carpets and corresponding ratios of IBZ versus ABZ

From: Crawling-induced floor dust resuspension affects the microbiota of the infant breathing zone

  PM or microbial group Infant breathing zone (IBZ) Adult breathing zone (ABZ) Ratio of IBZ to ABZ
Mean Min-max Mean Min-max Mean Min-max
Infant crawling experiments PM100 conc. [μg/m3] 210 87–310 73 18–150 4.6 1.3–12
Cherb [CE/m3] 13 4.9–29 1.7 0–8.5
PenAsp [CE/m3] 250 100–560 34 0–140 7.9 4.1–13
Total fungi [CE/m3] 450 91–1100 92 0–370 9.4 3.0–20
Gram pos [CE/m3] 14,000 1900–23,000 700 400–970 21 4.8–47
Gram neg [CE/m3] 8500 760–17,000 1300 400–3000 13 1.1–43
Adult walking experiments PM100 conc. [μg/m3] 50 22–79 43 17–70 1.3 0.4–1.9
Cherb [CE/m3] 3.7 0–9.3 4.5 0–15
PenAsp [CE/m3] 170 0–510 120 30–334 2.1 1.5–3.9
Total fungi [CE/m3] 310 37–1100 200 30–640 1.2 0.6–1.7
Gram pos [CE/m3] 5200 1400–9400 3600 830–6800 1.4 0.7–2.0
Gram neg [CE/m3] 3400 2200–7100 2300 1100–6100 1.8 1.2–2.2