Variables coded.

<p>Variables coded.</p

Guidelines for infant fNIRS reporting.

<p>Items in 'strongly recommended' are necessary to achieve basic standardization and thus we should strive to report them; those in 'additional' would also be included for completeness.</p

Proportion of infants excluded as a function of number of optodes.

<p>Number of optodes is totaled over sources and detectors. Each letter indicates an entry, coding for the system: ‘i’ stands for Hitachi, ‘a’ for Hamamatsu, and ‘x’ for all other systems. The boxplot on the right bottom panel represents the exact same data, collapsing into two categories: less than 20 optodes, and more than 20 optode.</p

Age groups studied.

<p>The upper boundary of the histogram has been fixed to exclude the outlier at 27 months.</p

Number of optodes as a function of year.

<p>Number of optodes is totaled over sources and detectors.</p