preferred walking speed
... that people's preferred walking speed is correlated with their country's per capita GDP and purchasing power parity?
... that people<span about="#mwt50" class="nowrap" data-mw="{&quot;parts&quot;:[{&quot;template&quot;:{&quot;target&quot;:{&quot;wt&quot;:&quot;'s&quot;,&quot;href&quot;:&quot;./Template:'s&quot;},&quot;params&quot;:{},&quot;i&quot;:0}}]}" id="mwDUc" style="padding-left:0.1em;" typeof="mw:Transclusion"><span typeof="mw:Entity">'</span>s</span> <b id="mwDUg"><a href="./Preferred_walking_speed" id="mwDUk" rel="mw:WikiLink" title="Preferred walking speed">preferred walking speed</a></b> is correlated with their country<span about="#mwt51" class="nowrap" data-mw="{&quot;parts&quot;:[{&quot;template&quot;:{&quot;target&quot;:{&quot;wt&quot;:&quot;'s&quot;,&quot;href&quot;:&quot;./Template:'s&quot;},&quot;params&quot;:{},&quot;i&quot;:0}}]}" id="mwDUo" style="padding-left:0.1em;" typeof="mw:Transclusion"><span typeof="mw:Entity">'</span>s</span> <a class="mw-redirect" href="./Per_capita_GDP" id="mwDUs" rel="mw:WikiLink" title="Per capita GDP">per capita GDP</a> and <a href="./Purchasing_power_parity" id="mwDUw" rel="mw:WikiLink" title="Purchasing power parity">purchasing power parity</a>?