1) Per capita penetration values may under represent the percentage of a population with access to the internet. This may be the case when comparing per capita values between two countries where average household sizes differ significantly (e.g. between Germany, where it is low, and say India, where average sizes are around twice as large)
2) The actual definition of ‘broadband’ itself varies. The latest UN/ITU statistics still define it as connections with download speeds of 256kpbs or higher, though may be in the process of redefining it at a higher speed. The speed definition also is very important when comparing quality of access say between wireless versus fixed wireline broadband (is the ‘broadband’ experience via a mobile phone comparable to cable modem or DSL access connected to a desktop PC?).
3) As mobile broadband, and more broadly, wireless broadband becomes more prevalent, the measure of mobile access is continuing to be refined. For accuracy, it will be important to measure mobile subscriptions based on active subscriptions of data-transmission, as opposed to just the aggregate of mobile devices with the possibility of data transmission. (And the ITU is in the process of refining this measure as well)

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