condition mean min max ZT0-3 81.062193 81.062193 81.062193 ZT4-7 251.695154 251.695154 251.695154 ZT8-11 261.0839585 261.0839585 261.0839585 ZT12-15 213.6810625 213.6810625 213.6810625 ZT16-19 127.4902005 127.4902005 127.4902005 ZT20-23 101.251869 101.251869 101.251869