condition mean min max ZT0-3 570.977466 570.977466 570.977466 ZT4-7 402.197817 402.197817 402.197817 ZT8-11 337.3422845 337.3422845 337.3422845 ZT12-15 434.7020755 434.7020755 434.7020755 ZT16-19 413.4099905 413.4099905 413.4099905 ZT20-23 437.2530365 437.2530365 437.2530365