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During this research, including meta-analyses of patterns of attachment types, is the impact of cofounding variables on findings. Studies conducted in different countries aren't usually matched for methodology when they are compared in reviews or meta-analyses. Sample characteristics such as poverty, social class and urban/rural make up can cofound results as can the age of participants studied in different countries. Environmental variables might also differ between studies and cofound results. For example, the size of the room and the availability of interesting toys there- babies might appear to explore more in studies conducted in small rooms with attractive toys compared to large, bare rooms. Less visible proximity-seeking because of room size might make a child more likely to be classified as avoidant.

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