condition mean min max ZT0-3 10.355948 10.355948 10.355948 ZT4-7 12.434412 12.434412 12.434412 ZT8-11 12.0320125 12.0320125 12.0320125 ZT12-15 11.2264165 11.2264165 11.2264165 ZT16-19 10.4432905 10.4432905 10.4432905 ZT20-23 12.1292565 12.1292565 12.1292565