condition mean min max ZT0-3 14.064706 14.064706 14.064706 ZT4-7 14.0551095 14.0551095 14.0551095 ZT8-11 14.358394 14.358394 14.358394 ZT12-15 13.571348 13.571348 13.571348 ZT16-19 13.7130845 13.7130845 13.7130845 ZT20-23 14.525534 14.525534 14.525534