Children Living near a Sanitary Landfill Have Increased Breath Methane and Methanobrevibacter smithii in Their Intestinal Microbiota

Table 2

Prevalence of breath CH₄ producers and children breath CH₄ concentration (ppm) in the three distinct groups.

	Slum near the landfill	Slum away from the landfill	High socioeconomic group
Breath CH4 producer prevalence	53.1% (59/111)^a	31.4% (11/35)^b	21.9% (7/32)^b	0.001^2
CH4 in breath CH4 producers	24 (18.0–35.0)^a	17.0 (10.0–31.0)^b	17 (11.0–19.0)^b	0.007^1
Total breath CH4	14 (0.0–25)^a	2.0 (0.0–9.5)^b	0.0 (0.0–2.5)^b	<0.001^1

Mann-Whitney test: the median and percentiles 25 and 75; ²Chi-squared test; different letters on the lines represent statistically significant differences ( < 0.05).