Example sentences of "[noun sg] [verb] for about a [num ord] " in BNC.
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| 1 | In the first Whitehall study risk factors such as age , smoking , systolic blood pressure , height , and plasma cholesterol and blood glucose concentration accounted for about a fifth of the twofold to threefold grade differences in mortality from coronary heart disease . |
| 2 | In the Whitehall II study , differences between subjects in health , health related behaviours , psychosocial aspects of the work environment , and social circumstances outside work accounted for about a third of the threefold to sixfold differences in sickness absence by grade . |
| 3 | Social security accounts for about a third of total public spending in most western states . |
| 4 | Groundwater accounts for about a third of the public water supplies in Britain ; in the south and east of England dependence on supplies from groundwater is locally much greater . |
| 5 | The oilbird 's click lasts for about a hundredth of a second and is not a single sound but a burst of pulses , each only about a thousandth of a second long . |