condition mean min max ZT0-3 5.3747375 4.89591 5.853565 ZT4-7 5.747809999999999 5.747809999999999 5.747809999999999 ZT8-11 5.5637550000000005 5.5637550000000005 5.5637550000000005 ZT12-15 0 0 0 ZT16-19 8.690394999999999 8.690394999999999 8.690394999999999 ZT20-23 9.0871 9.0871 9.0871