Variables Exposed group Non-exposed group P-value   Frequency Percent Frequency Percent Age (year)   44.96 22-65*  42.68 20-60* 0.874 Sex Male 12 38.71 24 41.38 0.790 Female 19 61.29 34 58.62 Total   31 100 58 100   BMI(kg/cm2)   21.55 16-29** 21.33 15-29** 0.926 NPO time(hr.)   10.61 8-14*** 10.29 7-14*** 0.981 Type of operation Gynaecological 12 38.71 18 31.03 0.642   General surgery 12 38.71 28 48.28   Orthopaedics surgery 7 22.58 12 20.69 Total    31 100  58 100 *Age range **Body mass index range ***NPO time.

Table 1: Demographic status of operated patient at Ayder Referral hospital Mekelle University, Northern Ethiopia, 2013.