condition mean min max ZT0-3 32.9828 32.9828 32.9828 ZT4-7 34.55425 34.55425 34.55425 ZT8-11 23.1705 23.1705 23.1705 ZT12-15 18.6316 18.6316 18.6316 ZT16-19 21.4348 21.4348 21.4348 ZT20-23 24.59675 24.59675 24.59675