condition mean min max ZT0-3 16.9381 16.9381 16.9381 ZT4-7 14.12185 14.12185 14.12185 ZT8-11 15.5593 15.5593 15.5593 ZT12-15 14.1187 14.1187 14.1187 ZT16-19 22.10885 22.10885 22.10885 ZT20-23 17.2462 17.2462 17.2462