condition mean min max ZT0-3 322.736761 322.736761 322.736761 ZT4-7 612.462826 612.462826 612.462826 ZT8-11 804.742146 804.742146 804.742146 ZT12-15 438.40358249999997 438.40358249999997 438.40358249999997 ZT16-19 265.22321750000003 265.22321750000003 265.22321750000003 ZT20-23 124.3480705 124.3480705 124.3480705