condition mean min max ZT0-3 18.215175000000002 16.38065 20.0497 ZT4-7 10.212685 10.212685 10.212685 ZT8-11 5.920925 5.920925 5.920925 ZT12-15 0 0 0 ZT16-19 23.640050000000002 23.640050000000002 23.640050000000002 ZT20-23 10.96575 10.96575 10.96575