Answer the question posed in Problem 14 69, while accounting for possible age and gender differences between groups FIELD DOC Column Variable 16 ID 8 Group (1 RHO 2 RPGR) 1114 Age at visit (XX X in years) 16 Gender (1 m 2 f) Gender is coded as missing, but is actually male for all members of the RPGR group 1827 Date of visit (month day year) 2934 Time from 1st visit in years 3643 Total field area right eye (OD) in degrees 2 4552 Total field area left eye (OS) in degrees 2 One possible complexity is that the age distribution of the 2 groups may not be balanced Also, the RHO group contains both males and females while the RPGR group consists exclusively of males Gender is also missing for some subjects in the RHO group Gender is coded as missing for subjects in the RPGR group because they are all male

Question: Answer the question posed in Problem 14.69, while accounting for possible age and gender differences between groups? FIELD.DOC Column _________________________________________ Variable 16 ............... ID 8

Answer the question posed in Problem 14.69, while accounting for possible age and gender differences between groups?

FIELD.DOC

Column _________________________________________ Variable

1−6 ……………………………….............………………………..… ID

8 …………………………………... Group (1 = RHO/2 = RPGR)

11−14 …………………………..…. Age at visit (XX.X in years)

16 ………………....………… Gender (1 = m/2 = f) Gender is

coded as missing, but is actually male for all members of the RPGR group.

18−27 …………..……………. Date of visit (month/day/year)

29−34 …….…....………………… Time from 1st visit in years

36−43 …..…. Total field area right eye (OD) in degrees²

45−52 …..…….. Total field area left eye (OS) in degrees²

One possible complexity is that the age distribution of the 2 groups may not be balanced. Also, the RHO group contains both males and females while the RPGR group consists exclusively of males. Gender is also missing for some subjects in the RHO group. Gender is coded as missing for subjects in the RPGR group because they are all male.

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