condition mean min max ZT0-3 82.621955 82.621955 82.621955 ZT4-7 73.7381755 73.7381755 73.7381755 ZT8-11 89.4645175 89.4645175 89.4645175 ZT12-15 123.7922465 123.7922465 123.7922465 ZT16-19 227.188538 227.188538 227.188538 ZT20-23 318.7126255 318.7126255 318.7126255