study  source               n1i   m1i   sd1i  n2i   m2i   sd2i
1      "Edinburgh"          155   55    47    156   75    64
2      "Orpington-Mild"     31    27    7     32    29    4
3      "Orpington-Moderate" 75    64    17    71    119   29
4      "Orpington-Severe"   18    66    20    18    137   48
5      "Montreal-Home"      8     14    8     13    18    11
6      "Montreal-Transfer"  57    19    7     52    18    4
7      "Newcastle"          34    52    45    33    41    34
8      "Umea"               110   21    16    183   31    27
9      "Uppsala"            60    30    27    52    23    20
