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Introduction: Sex  ratio  is  referred  to  male, female  ration which  is  usually  1.06. This  ratio  is  decreased  during  the  last  few  years. One of  its  reasons  seems  to  be  poisons  and  environmental  pollutions  such  as  cigarette  smoke.  In  this  investigation  we  studied  the relationship  between  fathers  cigarette  smoking  and  sex  ratio  in  children.
Materials  and  Methods: This  is  a  historical  cohort  study.  Study  population  were  neonates  born  in  Arak  hospitals  during  summer  and  autumn  1383.  Sample  size  was  determined  710  neonates, based  on α=5%, β=10%. Sampling  method  was  census  in  which  all  newborns  with  inclusion  criteria  were  selected  and  questionnaires  were  filled. Samples  were  divided  into  three  groups. 1-newborns  with  nonsmoker  fathers  2- newborns  with  smoker  fathers (less  than  20 cigarette  a day) 3- newborns  with  smoker  fathers  (20  or  more cigarettes  a  day) (fathers  cigarette  smoking  at  least  3  months  before  conception  in  second  and third  group). Newborns  sex  ratio  was  determined  in  each  group  and  caparisoned. Data  analysis  was  done  by  frequency, ratio, mean  and  standard  deviation  indexes  and  k-s, leven, t, mann-whitney, chi  square  tests  and  relative  risk, using  SPSS  software. At  all  stages  study  Helsinki  declaration  was  regarded.
Results:  Overall  sex  ratio  was  1.04. This  ratio  was  1.272  for neonates  with  nonsmoker  fathers  and  0.77  for  neonates  with  smoker  fathers. Also  sex  ratio  in  newborns  with  smoker  fathers  using  less  than  20  cigarettes a  day  was  0.846  and  for  those  with  fathers  using 20  or  more  was  0.60. Based on  chi  square  there  was  a  meaningful  relationship  between  the  three  groups (p<0.00001). Relative  risk  in  low  cigarette  group  was  1.23  and  in  high  cigarette  group  1.42.
Conclusion: Based  on  findings  it  seems  that  fathers  cigarette  smoking  near  conception  results  in  decreasing  sex  ratio  and  the  increased  use  of  cigarettes  the  decreased  born of  male  neonates. 
 

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Abstract Background: Study of the nursing and midwifery instructors and students viewpoints, as two important groups in teaching proccess, can be effect on codifying and evaluating of educational program and effectiveness in this courses. The purpose of this study was to determine the effective educational and evaluation program on clinical learning from the nursing and midwifery instructors and students’ opinion in Arak University of Medical Sciences, 2008. Materials and Methods: In a descriptive study in 2008, all students and clinical lecturer (n=84) were studied. The data gathering tool was a questionnaire consisted of three parts, demographic information, clinical education and evaluation program. Results: The age mean of the teachers and students respectively were 38±3.14, 22.2±2.18 years and the mean of theoretical and clinical history teaching of instructors, respectively, were 6.04±2.48 and 10./95±2.9 years. The most percents of instructors (91.3%) emphasized on considering the communicating skills education in education program. The most percents of students (85.2%) emphasized on considering the critical thinking and moral students support. Also, the most percents of instructors (78.3%) emphasized on step by step evaluation. While, the most percents of students (90.2%) emphasized on the effect of teachers evaluation and reflected the results to them. Conclusion: Hope to, this study results can be helpful to effective nursing and midwifery students’ lesson planning and evaluating.