condition mean min max ZT0-3 13.90215854725 8.446134254 19.3581828405 ZT4-7 42.317476049999996 36.44086559 48.19408651 ZT8-11 24.355046072500002 20.878034125 27.83205802 ZT12-15 9.040268154 7.396995038 10.68354127 ZT16-19 8.13166871 8.085117945 8.178219474999999 ZT20-23 6.700420909249999 5.342413991 8.0584278275