Average age of recent confirmed H7N9 cases is 49

[sharon sanders]

So far this flu season 2013-2014 there have been 11 confirmed cases with the average age of 49:


#137 - Man, 35, a company employee, now living in Shaoxing County. October 8 hospitalized in Shaoxing County Hospital. Now in serious condition. Zhejiang province

#138 - Man, 67, farmer, living in Xiuzhou. Onset date: October 16. Hospitalized October 18. Currently hospitalized seriously ill in Jiaxing. Zhejiang province

#139 - Boy, 3.5, Sichuan Suining living in Changping Town, Dongguan, sampled through routine surveillance on November 4, with mild symptoms. Onset date: October 29. Hospitalized October 31 Guangdong Province

#140 - Woman, 64, date of illness onset: October 30. hospitalized October 31 in critical condition. Zhejiang province

#141 - Man, 57, date of illness onset: November 20; hospitalized on November 25; in critical condition. Father of case #143 Zhejiang province

#142 - Woman, 36, Indonesian worker, date of illness onset: November 21, hospitalized November 27 in critical condition. Had history of travel to Shenzhen December 17 where she bought a chicken. Hong Kong PRC SAR

#143 - Man, 30, onset date November 29, son-in-law of case #141, hospitalized in Hangzhou December 5 in critical condition . Zhejiang province

#144 - Man, 80, onset and hospitalization date December 3, from Shenzhen, Guangdong province - traveled to Hong Kong for medical treatment Hong Kong PRC SAR

#145 - Man, 39, Fenggang Town, Dongguan City, Guangdong province

#146 - Woman, 65, who lives in Yangjiang City, as retirees, current patients in critical condition - Guangdong province

#147 - Man, 62, Yangjiang City, currently in critical condition - Guangdong province

http://www.flutrackers.com/forum/showpost.php?p=489904&postcount=1

[Giuseppe]

Re: Average age of recent confirmed H7N9 cases is 49

But median age (modal value) is 57: the value at the centre of the series.

3.5 - 30 - 35 - 36 - 39 - 57 - 62 - 64 - 65 - 67 - 80

I II III IV V VI VII VIII IX X XI

________________modal____________________

Average: 49

Median: 57

Range: 3.5 to 80

So the over 40 are overrepresented.

[sharon sanders]

Re: Average age of recent confirmed H7N9 cases is 49

I prefer the measurement of average.

Even if the outliers (the high and the low) of 3.5 (rounded to 4) and 80 are taken out of the equation, the average age is 49/50.

I believe, without calculating, this age is younger than the average age of cases since the beginning of the year. Also, none of these cases has died as of this date.

This might indicate younger people mount a more effective immune response and /or treatments are more effective now, or on a younger age group.

[Giuseppe]

Re: Average age of recent confirmed H7N9 cases is 49

Median age represent an indication of frequency of case distribution: all ages are not equally represented in a population demographics. An average value may match well if all ages are equally represented but not in the case of a population where youngsters are more prevalent that elderly.

Ie if over 50s are under-represented in a population (less than 50%) than a median value above 50% may indicate an higher prevalence in this class of age...