level of income level of incompetence level of indebtedness level of independence level of individual level of industrial level of inequality level of inflammation level of inflation level of influence level of information level of injury level of innovation level of insight level of instruction level of insulin level of insurance level of integration level of intellectual level of intelligence level of intensity level of interaction level of interactivity level of interest level of interest rates level of interference level of internal level of international level of internet level of intervention level of intimacy level of investment level of involvement level of italian level of job level of knowledge level of language level of lead level of leadership level of learning level of legal level of less level of life level of light level of liquid level of liquidity level of literacy level of living level of local level of long-term level of love level of low level of luxury level of magnesium level of maintenance level of maturity level of measurement level of media level of medical level of membership level of mental level of mercury level of military level of mobility level of monitoring level of motivation level of mutual level of national level of natural level of need level of noise level of obedience level of oil level of operation level of operational level of organisation level of organization level of other level of output level of overall level of oxygen level of pain level of participation level of patience level of patient level of payment level of perfection level of performance level of personal level of personalization level of physical level of physical activity level of physical fitness level of play level of policy level of political level of pollution level of popularity level of potassium