{"id":449,"date":"2015-07-27T22:39:28","date_gmt":"2015-07-27T21:39:28","guid":{"rendered":"http:\/\/pcool.dyndns.org:8080\/statsbook\/?page_id=449"},"modified":"2025-06-30T10:30:43","modified_gmt":"2025-06-30T09:30:43","slug":"growth-curves","status":"publish","type":"page","link":"https:\/\/pcool.dyndns.org\/index.php\/growth-curves\/","title":{"rendered":"Growth Curves"},"content":{"rendered":"<div class=\"entry-content\">\n<p>\u00a0<strong>P50 = mean = mode = median = 2<sup>nd<\/sup> quantile<\/strong><\/p>\n<p>Mean \u00b1 1 \u00d7 SD = 68.27 % : between 16<sup>th<\/sup> and 84<sup>th<\/sup> percentile<\/p>\n<p>Mean \u00b1 2 \u00d7 SD = 95.45 % : between 2<sup>nd<\/sup> and 98<sup>th<\/sup> percentile<\/p>\n<p>Mean \u00b1 3 \u00d7 SD = 99.73 % : between 0.1<sup>th<\/sup> and 99.9<sup> th<\/sup> percentile<\/p>\n<p><strong>Z-score = (height \u2013 mean height) \/ standard deviation<br \/>\n<\/strong><\/p>\n<p><em><strong>The Z-score is the number of standard deviations the <\/strong><\/em><\/p>\n<p><em><strong>bone mineral density measurement is above or below <\/strong><\/em><\/p>\n<p><em><strong>the age-matched mean bone mineral density.<\/strong><\/em><\/p>\n<p>Z-score = (BMD \u2013 <em>age-matched mean<\/em> BMD) \/ standard deviation<\/p>\n<p>(BMD = bone mineral density)<\/p>\n<p><em><strong>The T-score is the number of standard deviations the <\/strong><\/em><\/p>\n<p><em><strong>bone mineral density measurement is above or below <\/strong><\/em><\/p>\n<p><em><strong>the young-normal mean bone mineral density.<\/strong><\/em><\/p>\n<p>T-score = (BMD \u2013 <em>young-normal mean<\/em> BMD) \/ standard deviation<\/p>\n<p>(BMD = bone mineral density)<\/p>\n<p><strong>World Health Organisation definition (1994):<\/strong><\/p>\n<p><strong>Normal:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 T-score -1 or above<\/strong><\/p>\n<p><strong>Osteopenia:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0T-score between -1 and -2.5<\/strong><\/p>\n<p><strong>Osteoporosis:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0T-score less than -2.5<\/strong><\/p>\n<p><strong>Severe osteoporosis:\u00a0 T-score less than -2.5 and fragility fracture<\/strong><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0P50 = mean = mode = median = 2nd quantile Mean \u00b1 1 \u00d7 SD = 68.27 % : between 16th and 84th percentile Mean \u00b1 2 \u00d7 SD = 95.45 % : between 2nd and 98th percentile Mean \u00b1 3 \u00d7 SD = 99.73 % : between 0.1th and 99.9 th percentile Z-score = [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"inline_featured_image":false,"footnotes":""},"class_list":["post-449","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/pcool.dyndns.org\/index.php\/wp-json\/wp\/v2\/pages\/449","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pcool.dyndns.org\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pcool.dyndns.org\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pcool.dyndns.org\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/pcool.dyndns.org\/index.php\/wp-json\/wp\/v2\/comments?post=449"}],"version-history":[{"count":4,"href":"https:\/\/pcool.dyndns.org\/index.php\/wp-json\/wp\/v2\/pages\/449\/revisions"}],"predecessor-version":[{"id":4601,"href":"https:\/\/pcool.dyndns.org\/index.php\/wp-json\/wp\/v2\/pages\/449\/revisions\/4601"}],"wp:attachment":[{"href":"https:\/\/pcool.dyndns.org\/index.php\/wp-json\/wp\/v2\/media?parent=449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}