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. 2016 Jul 14;11(7):e0155223. doi: 10.1371/journal.pone.0155223

Table 11. Environment type (indoor, mixed, outdoor) frequency by 100% substrate coverage of hard (concrete and stone aggregate) or soft (grass, sand, and rubber padding) surfaces.

Flooring Surface
Environment Type Hard Soft Total
Indoor 122 80 202
Mixed 64 62 126
Outdoor 61 54 115
Total 247 196 443