This is probably the case. An examination of the temperature scatter plots reveals the relationship of the pressures and pulse are non linear. In fact, using a nonlinear, cubic fitting equation for the temperature vs pulse variable, a correlation on 0.99 is achieved. The sign indicates direction of the correlation. A negative sign corresponds to a decrease of both systolic and diastolic pressure with rising ambient temperature and the positive sign for the pulse is the reverse trend.
Results calculated from data for other ages is very similar to that reported above.