condition mean min max ZT0-3 12.371394 12.371394 12.371394 ZT4-7 12.932016 12.932016 12.932016 ZT8-11 12.435234 12.435234 12.435234 ZT12-15 15.265947 15.265947 15.265947 ZT16-19 13.5374655 13.5374655 13.5374655 ZT20-23 13.206031 13.206031 13.206031