condition mean min max ZT0-3 12.32495 12.32495 12.32495 ZT4-7 5.971135 5.971135 5.971135 ZT8-11 9.111165 9.111165 9.111165 ZT12-15 8.99984 8.99984 8.99984 ZT16-19 14.7928 14.7928 14.7928 ZT20-23 11.87575 11.87575 11.87575