condition mean min max ZT0-3 199.568161 199.568161 199.568161 ZT4-7 146.8929675 146.8929675 146.8929675 ZT8-11 155.382247 155.382247 155.382247 ZT12-15 601.897471 601.897471 601.897471 ZT16-19 240.52139 240.52139 240.52139 ZT20-23 499.4899185 499.4899185 499.4899185