condition mean min max ZT0-3 420.872144 420.872144 420.872144 ZT4-7 522.8680165000001 522.8680165000001 522.8680165000001 ZT8-11 475.450653 475.450653 475.450653 ZT12-15 480.29385750000006 480.29385750000006 480.29385750000006 ZT16-19 419.825066 419.825066 419.825066 ZT20-23 450.2875315 450.2875315 450.2875315