condition mean min max ZT0-3 0.0396899 0.0396899 0.0396899 ZT4-7 0.06643815 0.06643815 0.06643815 ZT8-11 0.0632047 0.0632047 0.0632047 ZT12-15 0.060269949999999996 0.060269949999999996 0.060269949999999996 ZT16-19 0.00961405 0.00961405 0.00961405 ZT20-23 0.02155315 0.02155315 0.02155315