condition mean min max ZT0-3 316.274095 316.274095 316.274095 ZT4-7 342.766363 342.766363 342.766363 ZT8-11 331.1561405 331.1561405 331.1561405 ZT12-15 358.562976 358.562976 358.562976 ZT16-19 270.1077545 270.1077545 270.1077545 ZT20-23 242.609927 242.609927 242.609927