condition mean min max ZT0-3 204.355723 204.355723 204.355723 ZT4-7 161.884633 161.884633 161.884633 ZT8-11 180.0595225 180.0595225 180.0595225 ZT12-15 225.403205 225.403205 225.403205 ZT16-19 190.4997315 190.4997315 190.4997315 ZT20-23 108.2964015 108.2964015 108.2964015