........................................................................................................................................ xvi CHAPTER ONE ..................................................................................................................................... 1 1.0 INTRODUCTION ............................................................................................................................ 1 1.1 Background ..................................................................................................................................... 1 1.2 Problem statement .......................................................................................................................... 2 1.3 Justification ..................................................................................................................................... 3 1.4 Research Questions ......................................................................................................................... 4 1.5 Null Hypothesis ............................................................................................................................... 4 1.6 Objectives......................................................................................................................................... 4 1.6.1 General Objective ........................................................................................................................ 4 1.6.2 Specific Objectives ....................................................................................................................... 5 CHAPTER TWO .................................................................................................................................... 6 2.0 LITERATURE REVIEW ................................................................................................................. 6 2.1 Asthma ............................................................................................................................................. 6