condition mean min max ZT0-3 15.2331 15.2331 15.2331 ZT4-7 13.45195 13.45195 13.45195 ZT8-11 12.15095 12.15095 12.15095 ZT12-15 13.032050000000002 13.032050000000002 13.032050000000002 ZT16-19 15.5562 15.5562 15.5562 ZT20-23 15.4393 15.4393 15.4393