condition mean min max ZT0-3 17.006050000000002 16.40795 17.60415 ZT4-7 32.8605 32.8605 32.8605 ZT8-11 16.7053 16.7053 16.7053 ZT12-15 0 0 0 ZT16-19 11.316324999999999 11.316324999999999 11.316324999999999 ZT20-23 20.2694 20.2694 20.2694