Stress is another physical consequence of time spent in child care. Sarah Watamura and her colleagues (2003) measured levels of salivary cortisol (a steroid used as an indicator of general stress) in groups of infants and toddlers who received care either in their homes or in child-care centres. Of those in child care, 35 percent of the infants and 71 percent of the toddlers showed a rise in cortisol across the day. Of those receiving care in their homes, however, 71 percent of the infants and 64 percent of the toddlers showed decreases in cortisol levels.
This quote is somewhat interesting in that it seems to deliberately obfuscate the figures. Notice that when talking about children in child care it gives the figures for a rise in cortisol levels whilst for those at home it gives the figures for a fall in cortisol levels. It makes any comparison impossible.
If we make the assumption that if cortisol levels don't fall, they rise then you have the following:
Rise in children in child care: Toddlers 71% Infants 35%
Rise in children at home: Toddlers 46% Infants 29%
However it doesn't really give figures to say how much they rise so again, it is pretty meaningless. In addition there is no link to studies showing that a rise is actually harmful.
