condition mean min max ZT0-3 13.844453 13.844453 13.844453 ZT4-7 13.390467000000001 13.390467000000001 13.390467000000001 ZT8-11 14.216422999999999 14.216422999999999 14.216422999999999 ZT12-15 12.355497 12.355497 12.355497 ZT16-19 14.183624 14.183624 14.183624 ZT20-23 14.444582 14.444582 14.444582