condition mean min max ZT0-3 2.2101643265 2.085290117 2.335038536 ZT4-7 1.9612020465 1.5350030485 2.3874010445 ZT8-11 1.7461273794999999 1.714056402 1.778198357 ZT12-15 1.4540646072499999 0.9487765175 1.959352697 ZT16-19 1.8190699175000002 1.290519756 2.3476200790000004 ZT20-23 5.4692074242499995 5.2778980644999995 5.660516784