condition mean min max ZT0-3 6.0481656645 4.341194879 7.75513645 ZT4-7 11.208683533999999 8.532960243 13.884406825 ZT8-11 10.45627412575 8.9431395925 11.969408658999999 ZT12-15 2.8736657135 2.463010219 3.2843212079999997 ZT16-19 2.7046792835 2.06071384 3.348644727 ZT20-23 8.917925381749999 6.2188254915 11.617025272