Lipoti la 2013 linapeza kuti anthu okwera njinga ndi pafupifupi 0.6% ya anthu onse oyenda pa njinga ku US, poyerekeza ndi 2.9% ku England ndi Wales.

Kukwera kumeneku kukubwera pamene chiwerengero cha mayiko ndi madera akumidzi akumanga zomangamanga monga misewu ya njinga kuti alimbikitse kuyendetsa njinga.

"M'zaka zaposachedwapa, madera ambiri achitapo kanthu kuti athandize njira zambiri zoyendera, monga kukwera njinga ndi kuyenda pansi," katswiri wa zachikhalidwe cha anthu ku Census Bureau Brian McKenzie analemba m'mawu omwe anali limodzi ndi lipotilo.

Kumadzulo kwa US kunali chiwerengero chachikulu cha anthu oyenda pa njinga pa 1.1%, ndipo Kum'mwera kunali kotsika kwambiri ndi 0.3%.

Mzinda wa Portland, Oregon, unalembetsa chiŵerengero chachikulu kwambiri cha anthu oyenda pa njinga ndi 6.1%, kuchokera pa 1.8% mu 2000.

Amuna adapezeka kuti ali ndi mwayi wokwera njinga kupita kuntchito kuposa akazi, ndipo nthawi yapakati yoyendera njinga yapezeka kuti ndi mphindi 19.3.

Pakadali pano, kafukufukuyu adapeza kuti 2.8% ya anthu oyenda pansi amapita kuntchito, zomwe zidatsika kuchokera pa 5.6% mu 1980.

Kumpoto chakum'mawa kunali chiwerengero chachikulu cha anthu oyenda pansi kupita kuntchito, chomwe chinali 4.7%.

Boston, Massachusetts, inali mzinda wapamwamba kwambiri wopita kuntchito ndi 15.1%, pomwe US ​​South inali ndi chiwerengero chotsika kwambiri cha madera omwe ali ndi chiwerengero cha 1.8%.