condition mean min max ZT0-3 17.6562 17.484949999999998 17.82745 ZT4-7 14.003499999999999 14.003499999999999 14.003499999999999 ZT8-11 11.367049999999999 11.367049999999999 11.367049999999999 ZT12-15 0 0 0 ZT16-19 13.511199999999999 13.511199999999999 13.511199999999999 ZT20-23 19.29335 19.29335 19.29335