TABLE 1.
Study cohort characteristics
| Country of origin | Initial number of fecal samples | Available samples after pre-processing | Infants born via Caesarean delivery | Infants born via vaginal delivery | Mean age of infants (months) | |
|---|---|---|---|---|---|---|
| Sampled at 1–2 months | ||||||
| COPSAC (26) | Denmark | 505 | 303 | 72 | 231 | 1 |
| HOUSTONa(27) | USA | 52 | 48 | 11 | 37 | 1.5 |
| INFANTMET (28) | Ireland | 167 | 137 | 65 | 72 | 1 |
| JORVI (29) | Finland | 68 | 51 | 8 | 43 | 1 |
| NHBCS (30) | USA | 321 | 319 | 92 | 227 | 1.5 |
| NOMIC (31) | Norway | 485 | 485 | 159 | 326 | 1 |
| WHEALS (32) | USA | 130 | 114 | 33 | 81 | 1.2 |
| Sampled at 3–6 months | ||||||
| INFANTMET (28) | Ireland | 152 | 152 | 86 | 66 | 5.5 |
| JORVI (29) | Finland | 68 | 62 | 10 | 52 | 6 |
| MARC-43 (33) | USA | 115 | 115 | 43 | 72 | 3.4 |
| WHEALS (32) | USA | 167 | 144 | 62 | 82 | 6.6 |
| Sampled at 9–12 months | ||||||
| ABIS (34) | Sweden | 403 | 399 | 47 | 352 | 12 |
| COPSAC (26) | Denmark | 623 | 424 | 90 | 334 | 12 |
| JORVI (29) | Finland | 62 | 62 | 10 | 52 | 12 |
| NHBCS (30) | USA | 135 | 135 | 38 | 97 | 12 |
| NOMIC (31) | Norway | 340 | 340 | 103 | 237 | 12 |
| OULU (35) | Finland | 84 | 84 | 23 | 61 | 12 |
| SKOT1 (36) | Denmark | 115 | 115 | 16 | 99 | 9 |
| SKOT2 (36) | Denmark | 107 | 106 | 36 | 70 | 9 |
a
Pregnant women prospectively enrolled in the early third trimester.