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. Author manuscript; available in PMC: 2021 Apr 8.
Published in final edited form as: Child Dev. 2017 Nov 2;90(3):759–773. doi: 10.1111/cdev.12974

Table 3.

Quantity of Caretaker Vocalization Directed to Infants Reported in Previous Work Using Systematic Observations (See Main Text for Details), Converted From Percentage of Observations Into Minutes Per Hour to Facilitate Comparison With Current Results

Citation Population Age (months) Min/hr
This study Tsimane 0–12 0.7
Klein et al. (1977) Guatemala 8 2
Klein et al. (1977) Guatemala 12 3
Tulkin and Kagan (1972) Boston Working 10 6
Klein et al. (1977) Guatemala 16 6
Konner (1977) !Kung 10 6
Tulkin and Kagan (1972) Boston Middle 10 10